feat(sub2api): 详情页新增「按 Key」tab；面板管理按钮间距收紧

详情页「按模型」分区改为 tab 切换：按模型 / 按 Key。
按 Key tab 调 GET /api/v1/usage/stats?api_key_id=N 逐个查询，并行拉取；
未使用的 Key（404）显示为 0 而非报错。

面板管理「复制/分组/删除」三个操作从 TextButton 改为可点击 Text，
去掉 58dp 最小宽度带来的过大间隔（用户反馈「间隔有点宽」）。

补齐三语言缺失字符串（sub2_home_spend / sub2_panel_delete_confirm_*
/ sub2_trend_account_scope / sub2_tab_by_* / sub2_no_key_data /
sub2_key_unused）。

app/src/main/java/com/rainy/token/data/repository/Sub2ApiRepository.kt

@@ -13,6 +13,9 @@ import java.time.temporal.ChronoUnit
 import java.util.TimeZone
 import javax.inject.Singleton
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.async
+import kotlinx.coroutines.awaitAll
+import kotlinx.coroutines.coroutineScope
 import kotlinx.coroutines.withContext
 import kotlinx.serialization.json.Json
 import kotlinx.serialization.json.JsonArray
@@ -526,6 +529,23 @@ class Sub2ApiRepository constructor(
      */
     data class WindowModelStats(val stats: List<Sub2ModelStat>, val allTime: Boolean = false)
 
+    /**
+     * 单个 Key 在所选窗口内的用量汇总（来源：面板「使用记录」页的
+     * GET /api/v1/usage/stats?start_date=&end_date=&api_key_id=N，实测 v0.2.10）。
+     *
+     * 未使用过的 Key 该端点返回 404 API_KEY_NOT_FOUND，故用 [unused] 表示
+     * 「面板无该 Key 的记录」，UI 显示为 0 而不是报错。
+     */
+    data class KeyUsageStat(
+        val keyId: Long,
+        val name: String,
+        val groupName: String?,
+        val requests: Long,
+        val totalTokens: Long,
+        val cost: Double,
+        val unused: Boolean = false
+    )
+
     /** 可用分组（切换分组选择器数据）。 */
     data class PanelGroup(val id: Long, val name: String, val rateMultiplier: Double, val description: String = "")
 
@@ -663,6 +683,77 @@ class Sub2ApiRepository constructor(
         }.getOrNull()
     }
 
+    /**
+     * 按 Key 统计（面板「使用记录」页口径，v0.2.10 实测）。
+     *
+     * 先取 Key 列表，再对每个 Key 调
+     * GET /api/v1/usage/stats?start_date=&end_date=&api_key_id=N。
+     * 未使用过的 Key 返回 404 API_KEY_NOT_FOUND —— 属「无记录」而非错误，
+     * 标记为 [KeyUsageStat.unused] 并计 0，不中断整个列表。
+     *
+     * 说明：面板没有「一次拿到所有 Key 用量」的端点（dashboard 下 keys 相关路由均 404，
+     * /api/v1/keys 上的 usage_1d/5h/7d 实测恒为 0），所以必须逐个查询，
+     * 故用 coroutineScope + async 并行，避免 Key 多时串行等待过久。
+     */
+    suspend fun fetchKeyUsageStats(startDate: LocalDate, endDate: LocalDate): Result<List<KeyUsageStat>> =
+        withContext(Dispatchers.IO) {
+            val (auth, base) = panelAuthOrNull()
+                ?: return@withContext Result.failure(RepositoryError.InvalidCredential("请先登录面板"))
+            val keys = fetchPanelKeys().getOrElse { return@withContext Result.failure(it) }
+            if (keys.isEmpty()) return@withContext Result.success(emptyList())
+
+            val start = startDate.toString()
+            val end = endDate.toString()
+            val tz = tzParam()
+            // 分组名映射（展示「Key · 分组」），拉取失败不影响主流程
+            val groups = runCatching { fetchPanelGroups().getOrNull().orEmpty() }
+                .getOrDefault(emptyList())
+                .associateBy { it.id }
+
+            val stats = coroutineScope {
+                keys.map { k ->
+                    async(Dispatchers.IO) {
+                        val resp = get(
+                            base,
+                            "/api/v1/usage/stats?start_date=$start&end_date=$end" +
+                                "&api_key_id=${k.id}&timezone=$tz",
+                            auth
+                        )
+                        val unused = resp == null || resp.code == 404
+                        val usage = if (!unused && resp!!.code in 200..299) {
+                            runCatching { parseKeyUsage(resp.body) }.getOrNull()
+                        } else null
+                        KeyUsageStat(
+                            keyId = k.id,
+                            name = k.name,
+                            groupName = k.groupId?.let { groups[it]?.name },
+                            requests = usage?.first ?: 0L,
+                            totalTokens = usage?.second ?: 0L,
+                            cost = usage?.third ?: 0.0,
+                            unused = unused
+                        )
+                    }
+                }.awaitAll()
+            }
+            Result.success(
+                stats.sortedWith(
+                    compareByDescending<KeyUsageStat> { it.cost }
+                        .thenByDescending { it.requests }
+                        .thenBy { it.name }
+                )
+            )
+        }
+
+    /** 解析 usage/stats → (requests, totalTokens, actualCost)。 */
+    private fun parseKeyUsage(body: String): Triple<Long, Long, Double>? {
+        val root = json.parseToJsonElement(body).jsonObject
+        val d = root["data"]?.jsonObject ?: root
+        val requests = d.longOr("total_requests") ?: return null
+        val tokens = d.longOr("total_tokens") ?: 0L
+        val cost = d.numberOr("total_actual_cost") ?: d.numberOr("total_cost") ?: 0.0
+        return Triple(requests, tokens, cost)
+    }
+
     /**
      * 新建 Key：POST /api/v1/keys {name, group_id?} → 返回明文 sk-key。
      * 兼容多种响应形态：data 为对象（key / api_key / sk_key / token 字段）、data 为字符串，

app/src/main/java/com/rainy/token/ui/servicedetail/ServiceDetailScreen.kt

@@ -120,6 +120,7 @@ fun ServiceDetailScreen(
     // 面板管理（Key/分组/兑换）已移到首页 Sub2API 卡片的「面板管理」入口，
     // 详情页只保留用量明细所需的窗口统计状态。
     val panelWindowStats by viewModel.panelWindowStats.collectAsStateWithLifecycle()
+    val panelKeyStats by viewModel.panelKeyStats.collectAsStateWithLifecycle()
     val config = ServiceConfigProvider.get(service)
     val isManualMode = config.method == FetchMethod.MANUAL
 
@@ -205,7 +206,9 @@ fun ServiceDetailScreen(
                         Sub2ApiUsageCard(
                             state = uiState.state,
                             windowStatsState = panelWindowStats,
-                            onLoadWindowModelStats = { from, to -> viewModel.loadPanelWindowModelStats(from, to) }
+                            onLoadWindowModelStats = { from, to -> viewModel.loadPanelWindowModelStats(from, to) },
+                            keyStatsState = panelKeyStats,
+                            onLoadKeyStats = { from, to -> viewModel.loadPanelKeyStats(from, to) }
                         )
                     }
                     // 面板管理（Key 列表/新建/分组/兑换）不再在详情页展示：

app/src/main/java/com/rainy/token/ui/servicedetail/ServiceDetailViewModel.kt

@@ -132,6 +132,36 @@ class ServiceDetailViewModel @Inject constructor(
         }
     }
 
+    /** 「按 Key」用量状态（面板使用记录口径，按当前时间周期）。 */
+    private val _panelKeyStats = MutableStateFlow<PanelKeyStatsState>(PanelKeyStatsState.Idle)
+    val panelKeyStats: StateFlow<PanelKeyStatsState> = _panelKeyStats.asStateFlow()
+
+    private var panelKeyStatsGeneration = 0
+
+    /** 按所选周期拉取「按 Key」用量。 */
+    fun loadPanelKeyStats(from: LocalDate, to: LocalDate) {
+        val generation = ++panelKeyStatsGeneration
+        _panelKeyStats.value = PanelKeyStatsState.Loading
+        viewModelScope.launch {
+            val result = sub2ApiRepository.fetchKeyUsageStats(from, to)
+            if (generation != panelKeyStatsGeneration) return@launch
+            result.fold(
+                onSuccess = { list ->
+                    _panelKeyStats.value = PanelKeyStatsState.Success(
+                        list.map {
+                            PanelKeyStatsState.KeyStat(
+                                keyId = it.keyId, name = it.name, groupName = it.groupName,
+                                requests = it.requests, totalTokens = it.totalTokens,
+                                cost = it.cost, unused = it.unused
+                            )
+                        }
+                    )
+                },
+                onFailure = { e -> _panelKeyStats.value = PanelKeyStatsState.Error(e.message ?: "加载按 Key 用量失败") }
+            )
+        }
+    }
+
     /** 刷新面板 Key 列表（仅 SUB2API 且有面板 Token）。 */
     fun loadPanelKeys() {
         viewModelScope.launch {
@@ -777,6 +807,19 @@ sealed class PanelWindowStatsState {
     data class Error(val message: String) : PanelWindowStatsState()
 }
 
+/** Sub2API「按 Key」用量状态（按当前时间周期查询面板使用记录）。 */
+sealed class PanelKeyStatsState {
+    data object Idle : PanelKeyStatsState()
+    data object Loading : PanelKeyStatsState()
+    data class Success(val stats: List<KeyStat>) : PanelKeyStatsState()
+    data class Error(val message: String) : PanelKeyStatsState()
+
+    data class KeyStat(
+        val keyId: Long, val name: String, val groupName: String?,
+        val requests: Long, val totalTokens: Long, val cost: Double, val unused: Boolean
+    )
+}
+
 sealed class State {
     data object Loading : State()
     data class Fresh(val data: ServiceBalance) : State()

app/src/main/java/com/rainy/token/ui/servicedetail/Sub2ApiPanelManagement.kt

@@ -5,6 +5,7 @@ import android.content.ClipboardManager
 import android.content.Context
 import android.widget.Toast
 import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
@@ -242,21 +243,44 @@ internal fun Sub2ApiPanelManagement(
                                         overflow = TextOverflow.Ellipsis
                                     )
                                 }
-                                TextButton(onClick = {
+                                // 三个操作紧凑排布（用户反馈「间隔有点宽」）。
-                                    copyToClipboard(context, key.key, copiedToast)
+                                // 注意：Material3 的 TextButton 会把 58dp 最小宽度与内边距加在
-                                }) { Text(stringResource(R.string.action_copy), style = MaterialTheme.typography.labelSmall) }
+                                // 其内层节点上，外层传 defaultMinSize(0)/contentPadding(0) 压不下去
+                                //（实测按钮可点区仍有 232px），所以这里直接用可点击 Text。
+                                Row(
+                                    verticalAlignment = Alignment.CenterVertically,
+                                    horizontalArrangement = Arrangement.spacedBy(10.dp)
+                                ) {
+                                    Text(
+                                        text = stringResource(R.string.action_copy),
+                                        style = MaterialTheme.typography.labelSmall,
+                                        color = MaterialTheme.colorScheme.primary,
+                                        modifier = Modifier
+                                            .clip(RoundedCornerShape(4.dp))
+                                            .clickable { copyToClipboard(context, key.key, copiedToast) }
+                                            .padding(horizontal = 2.dp, vertical = 4.dp)
+                                    )
                                     if (groups.isNotEmpty()) {
-                                    TextButton(onClick = { switchForKeyId = key.id }) {
+                                        Text(
-                                        Text(stringResource(R.string.sub2_panel_group_column), style = MaterialTheme.typography.labelSmall)
+                                            text = stringResource(R.string.sub2_panel_group_column),
-                                    }
+                                            style = MaterialTheme.typography.labelSmall,
+                                            color = MaterialTheme.colorScheme.primary,
+                                            modifier = Modifier
+                                                .clip(RoundedCornerShape(4.dp))
+                                                .clickable { switchForKeyId = key.id }
+                                                .padding(horizontal = 2.dp, vertical = 4.dp)
+                                        )
                                     }
                                     // 删除：用图标而非文字，避免一行挤下三个按钮在窄屏折行
-                                IconButton(onClick = { deleteForKeyId = key.id }) {
                                     Icon(
                                         imageVector = Icons.Filled.Delete,
                                         contentDescription = stringResource(R.string.action_delete),
                                         tint = MaterialTheme.colorScheme.error,
-                                        modifier = Modifier.size(18.dp)
+                                        modifier = Modifier
+                                            .clip(RoundedCornerShape(4.dp))
+                                            .clickable { deleteForKeyId = key.id }
+                                            .padding(2.dp)
+                                            .size(18.dp)
                                     )
                                 }
                             }

app/src/main/java/com/rainy/token/ui/servicedetail/Sub2ApiUsageCard.kt

@@ -33,6 +33,7 @@ import androidx.compose.ui.graphics.Brush
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import com.rainy.token.R
 import com.rainy.token.domain.model.Sub2DailyUsage
@@ -65,7 +66,10 @@ internal fun Sub2ApiUsageCard(
     onLoadWindowModelStats: ((from: LocalDate, to: LocalDate) -> Unit)? = null,
     /** 「今天」窗口的按小时趋势；非空时用小时柱替代按天柱（按天只有一根柱没有信息量）。 */
     hourlyTrend: List<Sub2DailyUsage> = emptyList(),
-    onLoadHourlyTrend: (() -> Unit)? = null
+    onLoadHourlyTrend: (() -> Unit)? = null,
+    /** 「按 Key」tab 的数据状态（按当前时间周期查询面板使用记录）。 */
+    keyStatsState: PanelKeyStatsState = PanelKeyStatsState.Idle,
+    onLoadKeyStats: ((from: LocalDate, to: LocalDate) -> Unit)? = null
 ) {
     val balance = when (state) {
         is State.Fresh -> state.data
@@ -104,6 +108,8 @@ internal fun Sub2ApiUsageCard(
             var window by remember { mutableStateOf(Sub2Window.TODAY) }
             // key=detail：刷新后模型列表变化时重置选中态，避免「每日区隐藏+无模型说明」的悬空状态
             var selectedModel by remember(detail) { mutableStateOf<String?>(null) }
+            // 明细分区 tab：按模型 / 按 Key
+            var detailTab by remember(detail) { mutableStateOf(DetailTab.MODEL) }
 
             // ── 时间窗口选择 ──
             LazyRow(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
@@ -140,6 +146,14 @@ internal fun Sub2ApiUsageCard(
                     onLoadWindowModelStats(from, to)
                 }
             }
+
+            // 「按 Key」tab 打开或切换时间周期时，按当前周期拉取按 Key 用量
+            LaunchedEffect(window, detailTab) {
+                if (onLoadKeyStats != null && detailTab == DetailTab.KEY) {
+                    val (from, to) = window.range()
+                    onLoadKeyStats(from, to)
+                }
+            }
             if (rangeLabel != null) {
                 Spacer(modifier = Modifier.height(8.dp))
                 Text(
@@ -270,7 +284,7 @@ internal fun Sub2ApiUsageCard(
                 }
             }
 
-            // ── 按模型统计（整卡始终展示，数据随所选时间周期变化）──
+            // ── 明细分区：「按模型 / 按 Key」两个 tab（数据都随所选时间周期变化）──
             val statsLoading = window != Sub2Window.ALL &&
                 (windowStatsState is PanelWindowStatsState.Idle || windowStatsState is PanelWindowStatsState.Loading)
             val statsError = (windowStatsState as? PanelWindowStatsState.Error)?.message
@@ -279,6 +293,33 @@ internal fun Sub2ApiUsageCard(
                 Spacer(modifier = Modifier.height(16.dp))
                 HorizontalDivider(color = MaterialTheme.colorScheme.outlineVariant.copy(alpha = 0.5f))
                 Spacer(modifier = Modifier.height(14.dp))
+
+                // tab 切换：按模型 / 按 Key
+                Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+                    FilterChip(
+                        selected = detailTab == DetailTab.MODEL,
+                        onClick = { detailTab = DetailTab.MODEL },
+                        label = { Text(stringResource(R.string.sub2_tab_by_model)) },
+                        colors = FilterChipDefaults.filterChipColors(
+                            selectedContainerColor = MaterialTheme.colorScheme.primary,
+                            selectedLabelColor = MaterialTheme.colorScheme.onPrimary
+                        )
+                    )
+                    FilterChip(
+                        selected = detailTab == DetailTab.KEY,
+                        onClick = { detailTab = DetailTab.KEY },
+                        label = { Text(stringResource(R.string.sub2_tab_by_key)) },
+                        colors = FilterChipDefaults.filterChipColors(
+                            selectedContainerColor = MaterialTheme.colorScheme.primary,
+                            selectedLabelColor = MaterialTheme.colorScheme.onPrimary
+                        )
+                    )
+                }
+                Spacer(modifier = Modifier.height(12.dp))
+
+                if (detailTab == DetailTab.KEY) {
+                    KeyUsageSection(keyStatsState)
+                } else {
                     Text(
                         text = stringResource(R.string.sub2_models_header) +
                             if (windowStatsAllTime) stringResource(R.string.sub2_models_alltime_suffix) else "",
@@ -343,6 +384,91 @@ internal fun Sub2ApiUsageCard(
             }
         }
     }
+}
+
+/** 明细分区 tab：按模型 / 按 Key。 */
+private enum class DetailTab { MODEL, KEY }
+
+/** 按 Key 用量区域：加载中/错误/空态/列表。 */
+@Composable
+private fun KeyUsageSection(state: PanelKeyStatsState) {
+    when (state) {
+        is PanelKeyStatsState.Idle,
+        is PanelKeyStatsState.Loading -> Text(
+            text = stringResource(R.string.common_loading),
+            style = MaterialTheme.typography.bodySmall,
+            color = inkMuted()
+        )
+        is PanelKeyStatsState.Error -> Text(
+            text = "✗ " + state.message,
+            style = MaterialTheme.typography.bodySmall,
+            color = MaterialTheme.colorScheme.error
+        )
+        is PanelKeyStatsState.Success -> {
+            if (state.stats.isEmpty()) {
+                Text(
+                    text = stringResource(R.string.sub2_no_key_data),
+                    style = MaterialTheme.typography.bodySmall,
+                    color = inkMuted()
+                )
+            } else {
+                state.stats.forEachIndexed { index, stat ->
+                    KeyUsageRow(stat)
+                    if (index != state.stats.lastIndex) {
+                        HorizontalDivider(
+                            modifier = Modifier.padding(vertical = 2.dp),
+                            color = MaterialTheme.colorScheme.outlineVariant.copy(alpha = 0.4f)
+                        )
+                    }
+                }
+            }
+        }
+    }
+}
+
+/** Key 一行：名称（+分组） + 请求/tokens + cost；未使用的 Key 灰显。 */
+@Composable
+private fun KeyUsageRow(stat: PanelKeyStatsState.KeyStat) {
+    Row(
+        modifier = Modifier.fillMaxWidth().padding(vertical = 8.dp),
+        verticalAlignment = Alignment.CenterVertically
+    ) {
+        Column(modifier = Modifier.weight(1f)) {
+            Text(
+                text = stat.name.ifBlank { "#" + stat.keyId },
+                style = MaterialTheme.typography.bodyMedium,
+                fontWeight = FontWeight.Medium,
+                color = if (stat.unused) inkMuted() else MaterialTheme.colorScheme.onSurface,
+                maxLines = 1,
+                overflow = TextOverflow.Ellipsis
+            )
+            Spacer(modifier = Modifier.height(2.dp))
+            Text(
+                text = buildString {
+                    stat.groupName?.takeIf { it.isNotBlank() }?.let { append(it).append(" · ") }
+                    if (stat.unused) append(stringResource(R.string.sub2_key_unused))
+                    else append(
+                        stringResource(
+                            R.string.sub2_model_meta,
+                            compactNum(stat.requests),
+                            compactNum(stat.totalTokens)
+                        )
+                    )
+                },
+                style = MaterialTheme.typography.bodySmall,
+                color = inkMuted(),
+                maxLines = 1,
+                overflow = TextOverflow.Ellipsis
+            )
+        }
+        Text(
+            text = if (stat.unused) "-" else formatCost(stat.cost),
+            style = MaterialTheme.typography.titleMedium,
+            fontWeight = FontWeight.SemiBold,
+            color = if (stat.unused) inkMuted() else MaterialTheme.colorScheme.onSurface
+        )
+    }
+}
 
 /** 时间窗口：按日期切片（近 N 天 = 今天及之前 N-1 天），不再按行数。 */
 private enum class Sub2Window(val labelRes: Int) {

app/src/main/res/values-b+zh+Hans/strings.xml

@@ -677,4 +677,12 @@
     <string name="sub2_auth_apikey">API 登录</string>
     <string name="sub2_home_requests">消耗 %1$d 次</string>
     <string name="sub2_balance_label">余额</string>
+    <string name="sub2_tab_by_model">按模型</string>
+    <string name="sub2_tab_by_key">按 Key</string>
+    <string name="sub2_no_key_data">该周期内没有 API Key 用量</string>
+    <string name="sub2_key_unused">本周期未使用</string>
+    <string name="sub2_home_spend">消耗 $%1$.2f</string>
+    <string name="sub2_panel_delete_confirm_title">删除 API Key</string>
+    <string name="sub2_panel_delete_confirm_body">确定删除「%1$s」吗？删除后无法恢复，正在使用该 Key 的客户端会立即失效。</string>
+    <string name="sub2_trend_account_scope">此图为账号整体趋势（无单模型维度）</string>
 </resources>

app/src/main/res/values-b+zh+Hant/strings.xml

@@ -677,4 +677,12 @@
     <string name="sub2_auth_apikey">API 登錄</string>
     <string name="sub2_home_requests">消耗 %1$d 次</string>
     <string name="sub2_balance_label">餘額</string>
+    <string name="sub2_tab_by_model">按模型</string>
+    <string name="sub2_tab_by_key">按 Key</string>
+    <string name="sub2_no_key_data">該週期內沒有 API Key 用量</string>
+    <string name="sub2_key_unused">本週期未使用</string>
+    <string name="sub2_home_spend">消耗 $%1$.2f</string>
+    <string name="sub2_panel_delete_confirm_title">刪除 API Key</string>
+    <string name="sub2_panel_delete_confirm_body">確定刪除「%1$s」嗎？刪除後無法復原，正在使用該 Key 的用戶端會立即失效。</string>
+    <string name="sub2_trend_account_scope">此圖為帳號整體趨勢（無單模型維度）</string>
 </resources>

app/src/main/res/values/strings.xml

@@ -682,4 +682,12 @@
     <string name="sub2_auth_apikey">API key login</string>
     <string name="sub2_home_requests">%1$d calls</string>
     <string name="sub2_balance_label">Balance</string>
+    <string name="sub2_tab_by_model">By model</string>
+    <string name="sub2_tab_by_key">By API key</string>
+    <string name="sub2_no_key_data">No API key usage in this period</string>
+    <string name="sub2_key_unused">Not used in this period</string>
+    <string name="sub2_home_spend">Spend $%1$.2f</string>
+    <string name="sub2_panel_delete_confirm_title">Delete API key</string>
+    <string name="sub2_panel_delete_confirm_body">Delete "%1$s"? This cannot be undone and any client using this key will stop working.</string>
+    <string name="sub2_trend_account_scope">Chart shows the whole account (no per-model breakdown)</string>
 </resources>