Initial commit: clean project structure

- Backend: FastAPI + SQLAlchemy + Celery (Python 3.11+)
- Frontend: Vue 3 + TypeScript + Pinia + Tailwind
- Admin Frontend: separate Vue 3 app for management
- Docker Compose: 9 services orchestration
- Specs: design prototypes, memory system PRD, product roadmap

Cleanup performed:
- Removed temporary debug scripts from backend root
- Removed deprecated admin_app.py (embedded UI)
- Removed duplicate docs from admin-frontend
- Updated .gitignore for Vite cache and egg-info

admin-frontend/src/api/client.ts

@@ -0,0 +1,45 @@
+const BASE_URL = ''
+
+class ApiClient {
+  async request<T>(url: string, options: RequestInit = {}): Promise<T> {
+    const response = await fetch(`${BASE_URL}${url}`, {
+      ...options,
+      credentials: 'include',
+      headers: {
+        'Content-Type': 'application/json',
+        ...options.headers,
+      },
+    })
+
+    if (!response.ok) {
+      const error = await response.json().catch(() => ({ detail: '请求失败' }))
+      throw new Error(error.detail || '请求失败')
+    }
+
+    return response.json()
+  }
+
+  get<T>(url: string): Promise<T> {
+    return this.request<T>(url)
+  }
+
+  post<T>(url: string, data?: unknown): Promise<T> {
+    return this.request<T>(url, {
+      method: 'POST',
+      body: data ? JSON.stringify(data) : undefined,
+    })
+  }
+
+  put<T>(url: string, data?: unknown): Promise<T> {
+    return this.request<T>(url, {
+      method: 'PUT',
+      body: data ? JSON.stringify(data) : undefined,
+    })
+  }
+
+  delete<T>(url: string): Promise<T> {
+    return this.request<T>(url, { method: 'DELETE' })
+  }
+}
+
+export const api = new ApiClient()