style: fix cargo warnings (imports, dead_code)

src/server/mod.rs

@@ -15,11 +15,10 @@ pub fn router(state: AppState) -> Router {
             state.clone(),
             rate_limiting::middleware::rate_limit_middleware,
         ))
-        .with_state(state)
+    .with_state(state)
-}
-}
 }
 
+
 /// GET /v1/models — OpenAI-compatible model listing.
 /// Returns all models from enabled providers so clients like Open WebUI can
 /// discover which models are available through the proxy.