seo improvement and updated notifs

backend/config.py

@@ -8,6 +8,8 @@ class Settings(BaseSettings):
     api_port: int = 8001
     environment: str = "development"
     frontend_url: str = "http://localhost:8000"
+    # Firebase Admin SDK service account JSON (paste the full JSON as a single-line string)
+    firebase_service_account_json: str = ""
 
     model_config = SettingsConfigDict(
         env_file=".env",