fix: support SISI_HF_API_KEY environment variable

- Added support for SISI_HF_API_KEY (primary)
- Fallback to API_KEY for compatibility
- Fixes 403 authentication error

app.py

@@ -17,7 +17,8 @@ logging.basicConfig(level=logging.INFO)
 logger = logging.getLogger(__name__)
 
 # 🔐 API Key Configuration
-API_KEY = os.environ.get("API_KEY", "sisi_default_key_change_me")
+# Support multiple env var names for flexibility
+API_KEY = os.environ.get("SISI_HF_API_KEY") or os.environ.get("API_KEY") or "sisi_default_key_change_me"
 
 
 def verify_api_key(x_api_key: Optional[str] = Header(None)):