Add traceback logging

app.py

@@ -141,10 +141,12 @@ async def proxy(req: Request, path: str):
                 )
 
         except Exception as e:
+            import traceback
             key_status[key]["fail"] += 1
             if key_status[key]["fail"] >= 3:
                 mark_dead(key)
             print(f"[ERROR] key={key[:15]} -> {type(e).__name__}: {e}")
+            print(f"[TRACE] {traceback.format_exc()}")
             continue
 
     return JSONResponse(