feat(commands): 工具执行页新增调用次数统计

「工具执行」页工具栏加「统计」按钮，弹窗按工具展示调用次数、占比与
失败次数，按次数降序。统计沿用列表的 task/q 筛选，算的是整个结果集
而非当前页；弹窗打开时才请求，翻页不会多付一次聚合查询。

- db: 抽出 commandFilter,列表与统计共用同一份 WHERE;新增 ToolStats
- server: GET /api/commands/stats
- web: 统计弹窗 + demo 模式 mock

web/src/lib/api.ts

@@ -71,6 +71,7 @@ import type {
   TokenTotal,
   TokenUsage,
   Tool,
+  ToolStat,
   TrafficDetail,
   TrafficHost,
   TrafficResp,
@@ -941,6 +942,13 @@ export const api = {
     sp.set("size", String(params?.size ?? 50));
     return get<{ commands: CommandRecord[]; total: number }>(`/commands?${sp}`);
   },
+  // 各工具调用次数；沿用列表的 task/q 筛选，统计的是整个结果集而非当前页。
+  commandStats: (params?: { task?: string; q?: string }) => {
+    const sp = new URLSearchParams();
+    if (params?.task) sp.set("task", params.task);
+    if (params?.q) sp.set("q", params.q);
+    return get<{ stats: ToolStat[] }>(`/commands/stats?${sp}`);
+  },
 
   // ---- LLM records ----
   llmRecords: (params?: { model?: string; session?: string; task?: string; page?: number; size?: number }) => {

web/src/lib/mock/handler.ts

@@ -1128,6 +1128,17 @@ function route(m: string, path: string, seg: string[], q: URLSearchParams, b: Re
 
   // ── 工具执行历史 ──
   if (path === "/commands" && m === "GET") return { commands: D.commandRecords, total: D.commandRecords.length };
+  if (path === "/commands/stats" && m === "GET") {
+    const tally = new Map<string, { tool: string; total: number; errors: number }>();
+    for (const c of D.commandRecords) {
+      const tool = c.tool || "-";
+      const s = tally.get(tool) ?? { tool, total: 0, errors: 0 };
+      s.total++;
+      if (c.is_error) s.errors++;
+      tally.set(tool, s);
+    }
+    return { stats: [...tally.values()].sort((a, b) => b.total - a.total || a.tool.localeCompare(b.tool)) };
+  }
 
   // ── LLM ──
   if (path === "/llm/records" && m === "GET") return { records: mockLLMRecords, total: mockLLMRecords.length };

web/src/lib/types.ts

@@ -1065,6 +1065,13 @@ export interface CommandRecord {
   created_at: string;
 }
 
+// 单个工具的调用统计（/commands/stats）；errors 为其中失败的次数。
+export interface ToolStat {
+  tool: string;
+  total: number;
+  errors: number;
+}
+
 // ---- LLM recording ----
 export interface LLMRecordItem {
   id: number;