fix(ui): 9项端到端真实审计 — 修复记忆/技能/审计/工作区/MCP数据流断裂

基于 Tauri MCP 实机排查发现并修复：

1. VikingPanel: viking_ls('/') 返回0 → 改为 viking_ls('') 返回100条记忆
2. 技能列表: loadSkillsCatalog 静默失败 → 添加直接 invoke('skill_list') 回退
3. 审计日志: 面板读Gateway API无数据 → 回退读localStorage双源数据
4. 工作区: 浏览按钮无事件 → 接入prompt选择 + workspace_dir_stats 命令
5. MCP: 空列表无引导 → 添加配置文件路径提示
6. 新增 workspace_dir_stats Tauri 命令 (Rust)

排查确认正常的功能: 安全存储(OS Keyring✅), 心跳引擎(运行中✅),
定时任务(管道连通), Kernel(已初始化✅), SaaS relay模式

desktop/src/store/configStore.ts

@@ -450,21 +450,50 @@ export const useConfigStore = create<ConfigStateSlice & ConfigActionsSlice>((set
 
   loadSkillsCatalog: async () => {
     const client = get().client;
-    if (!client) return;
 
-    try {
-      const result = await client.listSkills();
-      set({ skillsCatalog: result?.skills || [] });
-      if (result?.extraDirs) {
-        set((state) => ({
-          quickConfig: {
-            ...state.quickConfig,
-            skillsExtraDirs: result.extraDirs,
-          },
-        }));
+    // Path A: via injected client (KernelClient or GatewayClient)
+    if (client) {
+      try {
+        const result = await client.listSkills();
+        if (result?.skills && result.skills.length > 0) {
+          set({ skillsCatalog: result.skills });
+          if (result.extraDirs) {
+            set((state) => ({
+              quickConfig: {
+                ...state.quickConfig,
+                skillsExtraDirs: result.extraDirs,
+              },
+            }));
+          }
+          return;
+        }
+      } catch (err) {
+        console.warn('[configStore] listSkills via client failed, trying direct invoke:', err);
       }
-    } catch {
-      // Ignore if skills list not available
+    }
+
+    // Path B: direct Tauri invoke fallback (works even without client injection)
+    try {
+      const skills = await invoke('skill_list');
+      if (Array.isArray(skills) && skills.length > 0) {
+        set({ skillsCatalog: skills.map((s: Record<string, unknown>) => ({
+          id: s.id as string,
+          name: s.name as string,
+          description: (s.description as string) || '',
+          version: (s.version as string) || '',
+          capabilities: (s.capabilities as string[]) || [],
+          tags: (s.tags as string[]) || [],
+          mode: (s.mode as string) || '',
+          triggers: ((s.triggers as string[]) || []).map((t: string) => ({ type: 'keyword' as const, pattern: t })),
+          actions: ((s.capabilities as string[]) || []).map((cap: string) => ({ type: cap, params: undefined })),
+          enabled: (s.enabled as boolean) ?? true,
+          category: s.category as string,
+          source: ((s.source as string) || 'builtin') as 'builtin' | 'extra',
+          path: s.path as string | undefined,
+        })) });
+      }
+    } catch (err) {
+      console.warn('[configStore] skill_list direct invoke also failed:', err);
     }
   },