feat: 重构前后端架构，添加Go后端和Python Agent服务

- 新增 Go 语言后端服务(server/)，包含用户认证、Agent管理、数据库连接等API
- 新增 Python Agent 服务(agent/)，实现Agent核心逻辑和工具集
- 前端从原生HTML迁移到Vue.js框架(web/src/)
- 添加 Docker Compose 支持(docker-compose.yml)
- 添加项目架构文档(docs/ARCHITECTURE.md)
- 添加环境变量示例(.env.example)和本地启动脚本(start-local.ps1)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

agent/app/api/routes.py

@@ -0,0 +1,149 @@
+"""
+API 路由定义
+"""
+from typing import Optional
+
+from fastapi import APIRouter, Depends, HTTPException
+from pydantic import BaseModel
+
+from app.agent.core.agent import AgentManager
+from app.security.approval import ApprovalService
+
+
+router = APIRouter()
+
+# 全局依赖（实际应该注入）
+_agent_manager: Optional[AgentManager] = None
+_approval_service: Optional[ApprovalService] = None
+
+
+def get_agent_manager() -> AgentManager:
+    """获取 Agent 管理器"""
+    # 这里应该从 app.state 获取
+    from app.main import agent_manager
+    if agent_manager is None:
+        raise HTTPException(status_code=503, detail="Agent service not initialized")
+    return agent_manager
+
+
+def get_approval_service() -> ApprovalService:
+    """获取审批服务"""
+    global _approval_service
+    if _approval_service is None:
+        _approval_service = ApprovalService()
+    return _approval_service
+
+
+# ==================== 请求/响应模型 ====================
+
+class ChatRequest(BaseModel):
+    """聊天请求"""
+    agent_id: str
+    message: str
+    session_id: str = ""
+    context: dict = {}
+
+
+class ChatResponse(BaseModel):
+    """聊天响应"""
+    reply: str
+    session_id: str
+    tools_used: list[str] = []
+    metadata: dict = {}
+
+
+class ApprovalRequest(BaseModel):
+    """审批请求"""
+    request_id: str
+    tool_name: str
+    params: dict
+    reason: str
+    approved: bool
+
+
+# ==================== API 端点 ====================
+
+@router.post("/chat", response_model=ChatResponse)
+async def chat(
+    request: ChatRequest,
+    agent_manager: AgentManager = Depends(get_agent_manager)
+):
+    """处理 Agent 聊天请求"""
+    try:
+        # 生成会话ID
+        if not request.session_id:
+            import uuid
+            request.session_id = str(uuid.uuid4())
+
+        # 执行 Agent
+        result = await agent_manager.execute(
+            agent_id=request.agent_id,
+            message=request.message,
+            session_id=request.session_id,
+            context=request.context
+        )
+
+        return ChatResponse(
+            reply=result.get("reply", ""),
+            session_id=request.session_id,
+            tools_used=result.get("tools_used", []),
+            metadata=result.get("metadata", {})
+        )
+
+    except ValueError as e:
+        raise HTTPException(status_code=404, detail=str(e))
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=f"Agent execution failed: {str(e)}")
+
+
+@router.post("/tool/request")
+async def request_tool_execution(
+    request: dict,
+    approval_service: ApprovalService = Depends(get_approval_service)
+):
+    """请求执行工具（需要审批）"""
+    tool_name = request.get("tool_name")
+    params = request.get("params", {})
+    user_id = request.get("user_id", "unknown")
+    agent_id = request.get("agent_id")
+    reason = request.get("reason", "")
+
+    # 创建审批请求
+    request_id = await approval_service.request_approval(
+        tool_name=tool_name,
+        params=params,
+        user_id=user_id,
+        agent_id=agent_id or "",
+        reason=reason
+    )
+
+    return {
+        "request_id": request_id,
+        "status": "pending"
+    }
+
+
+@router.get("/tools")
+async def list_tools(agent_manager: AgentManager = Depends(get_agent_manager)):
+    """列出所有可用工具"""
+    tools = agent_manager.list_tools()
+    return {"tools": [tool.dict() for tool in tools]}
+
+
+@router.get("/agents")
+async def list_agents(agent_manager: AgentManager = Depends(get_agent_manager)):
+    """列出所有已加载的 Agent"""
+    agents = agent_manager.list_agents()
+    return {"agents": agents}
+
+
+@router.get("/agent/{agent_id}")
+async def get_agent(
+    agent_id: str,
+    agent_manager: AgentManager = Depends(get_agent_manager)
+):
+    """获取特定 Agent 信息"""
+    agent_info = agent_manager.get_agent_info(agent_id)
+    if not agent_info:
+        raise HTTPException(status_code=404, detail="Agent not found")
+    return agent_info