feat(client): 完成 P3 业务页联动闭环（D6/D8/D10/D11）

- 待办：列表/详情 + approve/reject/return/transfer（D6）
- 报销：列表/详情 + create/submit/withdraw/pay（D8）
- 票据：列表/上传/OCR轮询/绑定/预览（D10）
- 统一：Api types + 错误映射 + react-query缓存失效（D11）

client/src/router/index.tsx

@@ -8,7 +8,9 @@ import { InvoicePoolPage } from "../pages/InvoicePoolPage";
 import { LoginPage } from "../pages/LoginPage";
 import { NotFoundPage } from "../pages/NotFoundPage";
 import { ProfilePage } from "../pages/ProfilePage";
+import { ReimbursementDetailPage } from "../pages/ReimbursementDetailPage";
 import { ReimbursementsPage } from "../pages/ReimbursementsPage";
+import { WorkflowTaskDetailPage } from "../pages/WorkflowTaskDetailPage";
 import { WorkflowTasksPage } from "../pages/WorkflowTasksPage";
 import { GuestOnly, RequireAuth, RequirePermission } from "./guards";
 
@@ -46,6 +48,15 @@ export function AppRouter() {
           }
         />
 
+        <Route
+          path="reimbursements/:reimbursementId"
+          element={
+            <RequirePermission anyOf={["expense.view_own", "expense.view_all"]}>
+              <ReimbursementDetailPage />
+            </RequirePermission>
+          }
+        />
+
         <Route
           path="workflow/tasks"
           element={
@@ -55,6 +66,15 @@ export function AppRouter() {
           }
         />
 
+        <Route
+          path="workflow/tasks/:taskId"
+          element={
+            <RequirePermission anyOf={["expense.approve"]}>
+              <WorkflowTaskDetailPage />
+            </RequirePermission>
+          }
+        />
+
         <Route
           path="invoice-pool"
           element={