Add authentication settings (APP_PASSWORD, SESSION_SECRET_KEY) to config

app/config.py

@@ -93,6 +93,16 @@ class Settings(BaseSettings):
     WANDB_API_KEY: Optional[str] = None
     WANDB_PROJECT: str = "universal-model-trainer"
     
+    # Authentication (set via HF Space secrets)
+    APP_PASSWORD: str = ""  # Set via APP_PASSWORD env var / HF secret
+    SESSION_SECRET_KEY: str = "change-this-in-production-use-random-32-chars"
+    SESSION_EXPIRE_HOURS: int = 24
+    
+    @property
+    def is_auth_configured(self) -> bool:
+        """Check if authentication is configured"""
+        return bool(self.APP_PASSWORD)
+    
     # Security
     API_KEY_HEADER: str = "X-API-Key"
     ENABLE_AUTH: bool = False