fix: resolve remaining clippy warnings and improve workflow frontend

- Collapse nested if-let in user_service.rs search filter
- Suppress dead_code warning on ApiDoc struct
- Refactor server routing: nest all routes under /api/v1 prefix
- Simplify health check route path
- Improve workflow ProcessDesigner with edit mode and loading states
- Update workflow pages with enhanced UX
- Add Phase 2 implementation plan document

apps/web/src/pages/workflow/InstanceMonitor.tsx

@@ -1,5 +1,5 @@
-import { useEffect, useState } from 'react';
-import { Button, message, Space, Table, Tag } from 'antd';
+import { useCallback, useEffect, useState } from 'react';
+import { Button, message, Modal, Table, Tag } from 'antd';
 import type { ColumnsType } from 'antd/es/table';
 import {
   listInstances,
@@ -20,7 +20,7 @@ export default function InstanceMonitor() {
   const [page, setPage] = useState(1);
   const [loading, setLoading] = useState(false);
 
-  const fetch = async () => {
+  const fetchData = useCallback(async () => {
     setLoading(true);
     try {
       const res = await listInstances(page, 20);
@@ -29,18 +29,27 @@ export default function InstanceMonitor() {
     } finally {
       setLoading(false);
     }
-  };
+  }, [page]);
 
-  useEffect(() => { fetch(); }, [page]);
+  useEffect(() => { fetchData(); }, [fetchData]);
 
   const handleTerminate = async (id: string) => {
-    try {
-      await terminateInstance(id);
-      message.success('已终止');
-      fetch();
-    } catch {
-      message.error('操作失败');
-    }
+    Modal.confirm({
+      title: '确认终止',
+      content: '确定要终止该流程实例吗？此操作不可撤销。',
+      okText: '确定终止',
+      okType: 'danger',
+      cancelText: '取消',
+      onOk: async () => {
+        try {
+          await terminateInstance(id);
+          message.success('已终止');
+          fetchData();
+        } catch {
+          message.error('操作失败');
+        }
+      },
+    });
   };
 
   const columns: ColumnsType<ProcessInstanceInfo> = [