refactor: replace the real hf url with the place holder

utils/config.py

@@ -5,7 +5,7 @@ load_dotenv()
 
 # API Configuration
 API_CONFIG = {
-    "api_base_url": os.getenv("DS_API_BASE_URL", "https://learning.test.orbitant.dev/api"),
+    "api_base_url": os.getenv("DS_API_BASE_URL", "https://dnext-ds-api.hf.space"),
     "api_endpoint": os.getenv("DS_API_ENDPOINT", "/mcp_bug_localization"),
     "timeout": 30.0,
 }