v3接口restful风格，规范化接口；添加mcp服务器；新增log模块

backend/main.py

@@ -1,13 +1,28 @@
 from fastapi import FastAPI
-from backend.routers import v1, v2
+from fastapi.middleware.cors import CORSMiddleware
+from backend.routers import v3
+from backend.core.logger import setup_logging
 
-app = FastAPI(title="Wiki Crawler API")
+# 程序启动第一件事：初始化日志
+setup_logging()
 
-# 挂载路由
-app.include_router(v1.router)
-app.include_router(v2.router)
+
+app = FastAPI(
+    title="Wiki Crawler System V3",
+    version="3.0.0",
+    description="Enterprise-grade RAG Knowledge Base API with Real-time Monitoring"
+)
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+app.include_router(v3.router)
 
 if __name__ == "__main__":
     import uvicorn
-    # 提示：运行方式 uv run backend/main.py 或 uvicorn backend.main:app --reload
-    uvicorn.run(app, host="0.0.0.0", port=8000, reload=True)
+    uvicorn.run(app, host="0.0.0.0", port=8000)