feat(web): 工作台前端 API 客户端 + TodoList 组件

- actionInbox.ts 新增 WorkbenchStats/TeamOverview 类型和 stats()/team() API
- 新建 workbench/TodoList.tsx 待办列表组件（分页 + 类型/优先级标签）

apps/web/src/api/health/actionInbox.ts

@@ -42,6 +42,35 @@ export interface ThreadResponse {
   available_actions: ActionDefinition[];
 }
 
+export interface WorkbenchStats {
+  total_pending: number;
+  ai_suggestion_pending: number;
+  urgent_alerts: number;
+  followup_due: number;
+  completion_rate: number | null;
+}
+
+export interface TeamMemberOverview {
+  user_id: string;
+  name: string;
+  title: string;
+  pending_count: number;
+  completed_count: number;
+  overdue_count: number;
+  completion_rate: number;
+}
+
+export interface TeamOverview {
+  members: TeamMemberOverview[];
+  risk_distribution: {
+    high: number;
+    medium: number;
+    low: number;
+  };
+  total_pending: number;
+  total_completed: number;
+}
+
 export const actionInboxApi = {
   list: async (params?: {
     status?: string;
@@ -63,4 +92,20 @@ export const actionInboxApi = {
     }>(`/health/action-inbox/${encodeURIComponent(sourceRef)}/thread`);
     return data.data;
   },
+
+  stats: async () => {
+    const { data } = await client.get<{
+      success: boolean;
+      data: WorkbenchStats;
+    }>('/health/action-inbox/stats');
+    return data.data;
+  },
+
+  team: async () => {
+    const { data } = await client.get<{
+      success: boolean;
+      data: TeamOverview;
+    }>('/health/action-inbox/team');
+    return data.data;
+  },
 };