fix: resolve double data unwrapping issue in API calls

Issue: projectApi and agentApi were unwrapping response.data twice:
1. request interceptor returns response.data
2. API functions returned response.data again (undefined)

This caused all API calls to fail silently with 'response.success' being undefined.

Fixed:
- projectApi: Removed redundant .data access
- agentApi: Removed redundant .data access

All API functions now correctly return the backend response:
{ success: true, data: [...] }

This fixes:
- '鑾峰彇椤圭洰鍒楄〃澶辫触' error on page load
- '鍒涘缓椤圭洰澶辫触' error when creating projects
- Any other API call failures

frontend/src/api/agentApi.ts

@@ -33,32 +33,27 @@ export interface ApiResponse<T = any> {
 export const agentApi = {
   // 获取所有智能体列表
   getAll: async (): Promise<ApiResponse<AgentConfig[]>> => {
-    const response = await request.get('/agents');
-    return response.data;
+    return await request.get('/agents');
   },
 
   // 获取启用的智能体列表
   getEnabled: async (): Promise<ApiResponse<AgentConfig[]>> => {
-    const response = await request.get('/agents/enabled');
-    return response.data;
+    return await request.get('/agents/enabled');
   },
 
   // 获取单个智能体详情
   getById: async (id: string): Promise<ApiResponse<AgentConfig>> => {
-    const response = await request.get(`/agents/${id}`);
-    return response.data;
+    return await request.get(`/agents/${id}`);
   },
 
   // 根据分类获取智能体
   getByCategory: async (category: string): Promise<ApiResponse<AgentConfig[]>> => {
-    const response = await request.get(`/agents/by-category?category=${encodeURIComponent(category)}`);
-    return response.data;
+    return await request.get(`/agents/by-category?category=${encodeURIComponent(category)}`);
   },
 
   // 获取智能体的系统Prompt
   getSystemPrompt: async (id: string): Promise<ApiResponse<{ agentId: string; systemPrompt: string }>> => {
-    const response = await request.get(`/agents/${id}/system-prompt`);
-    return response.data;
+    return await request.get(`/agents/${id}/system-prompt`);
   },
 
   // 渲染用户Prompt
@@ -70,8 +65,7 @@ export const agentApi = {
       knowledgeBaseContext?: string;
     }
   ): Promise<ApiResponse<{ agentId: string; renderedPrompt: string }>> => {
-    const response = await request.post(`/agents/${id}/render-prompt`, data);
-    return response.data;
+    return await request.post(`/agents/${id}/render-prompt`, data);
   },
 };
 

frontend/src/api/projectApi.ts

@@ -23,20 +23,17 @@ export interface UpdateProjectRequest {
 export const projectApi = {
   // 获取项目列表
   getProjects: async (): Promise<ApiResponse<Project[]>> => {
-    const response = await request.get('/projects');
-    return response.data;
+    return await request.get('/projects');
   },
 
   // 获取单个项目详情
   getProjectById: async (id: string): Promise<ApiResponse<Project>> => {
-    const response = await request.get(`/projects/${id}`);
-    return response.data;
+    return await request.get(`/projects/${id}`);
   },
 
   // 创建项目
   createProject: async (data: CreateProjectRequest): Promise<ApiResponse<Project>> => {
-    const response = await request.post('/projects', data);
-    return response.data;
+    return await request.post('/projects', data);
   },
 
   // 更新项目
@@ -44,14 +41,12 @@ export const projectApi = {
     id: string,
     data: UpdateProjectRequest
   ): Promise<ApiResponse<Project>> => {
-    const response = await request.put(`/projects/${id}`, data);
-    return response.data;
+    return await request.put(`/projects/${id}`, data);
   },
 
   // 删除项目
   deleteProject: async (id: string): Promise<ApiResponse> => {
-    const response = await request.delete(`/projects/${id}`);
-    return response.data;
+    return await request.delete(`/projects/${id}`);
   },
 };