style: fix cargo warnings (imports, dead_code)

src/server/mod.rs

@@ -17,8 +17,7 @@ pub fn router(state: AppState) -> Router {
         ))
     .with_state(state)
 }
-}
-}
+
 
 /// GET /v1/models — OpenAI-compatible model listing.
 /// Returns all models from enabled providers so clients like Open WebUI can