Fix Cascade egress verify to bind awg0 IP (v2.2.1).

Use client-subnet policy routing for curl checks instead of cascade peer Address; soft-warn when echo services fail but the route is OK.

app.py

@@ -102,7 +102,7 @@ else:
     application_path = os.path.dirname(__file__)
 
 DATA_FILE = os.path.join(application_path, 'data.json')  # legacy JSON; used only for one-shot import / export
-CURRENT_VERSION = "v2.2.0"
+CURRENT_VERSION = "v2.2.1"
 RELEASES_REPO_URL = "https://git.evilfox.cc/test2/Amnezia-Web-Panel-main"
 RELEASES_API_LATEST = "https://git.evilfox.cc/api/v1/repos/test2/Amnezia-Web-Panel-main/releases/latest"
 BIN_DIR = os.environ.get('TUNNEL_BIN_DIR', os.path.join(application_path, 'bin'))
@@ -3476,7 +3476,12 @@ async def api_cascade_setup(request: Request, server_id: int, req: CascadeSetupR
         }
         async with DATA_LOCK:
             await asyncio.to_thread(save_data, data)
-        return {'status': 'success', 'cascade': entry['cascade'], 'applied': applied}
+        return {
+            'status': 'success',
+            'cascade': entry['cascade'],
+            'applied': applied,
+            'warning': applied.get('warning'),
+        }
     except Exception as e:
         logger.exception("Error setting up cascade")
         return JSONResponse({'error': str(e)}, status_code=500)