Add notification service using Google ADK

src/va_agent/config.py

@@ -26,6 +26,12 @@ class AgentSettings(BaseSettings):
     # Firestore configuration
     firestore_db: str
 
+    # Notifications configuration
+    notifications_collection_path: str = (
+        "artifacts/bnt-orquestador-cognitivo-dev/notifications"
+    )
+    notifications_max_to_notify: int = 5
+
     # MCP configuration
     mcp_audience: str
     mcp_remote_url: str