feat(secrets-mcp): MCP 请求日志、探测 404 与资源元数据

- 新增 logging 中间件：记录 client_ip、ua、JSON-RPC、tool 等
- tools 各入口/出口结构化日志
- 探测型 404（/.well-known、GET /mcp）降为 debug
- /.well-known/oauth-protected-resource 最小元数据
- secrets-mcp 0.1.11

Made-with: Cursor

crates/secrets-mcp/src/main.rs

@@ -1,4 +1,5 @@
 mod auth;
+mod logging;
 mod oauth;
 mod tools;
 mod web;
@@ -53,7 +54,8 @@ async fn main() -> Result<()> {
 
     tracing_subscriber::fmt()
         .with_env_filter(
-            EnvFilter::try_from_default_env().unwrap_or_else(|_| "secrets_mcp=info".into()),
+            EnvFilter::try_from_default_env()
+                .unwrap_or_else(|_| "secrets_mcp=info,tower_http=info".into()),
         )
         .init();
 
@@ -120,6 +122,9 @@ async fn main() -> Result<()> {
     let router = Router::new()
         .merge(web::web_router())
         .nest_service("/mcp", mcp_service)
+        .layer(axum::middleware::from_fn(
+            logging::request_logging_middleware,
+        ))
         .layer(axum::middleware::from_fn_with_state(
             pool,
             auth::bearer_auth_middleware,