Fix V1 MCP services (Fix tavily search) (#11840)

Co-authored-by: openhands <openhands@all-hands.dev>

openhands/app_server/user/user_context.py

@@ -34,6 +34,10 @@ class UserContext(ABC):
     async def get_secrets(self) -> dict[str, SecretSource]:
         """Get custom secrets and github provider secrets for the conversation."""
 
+    @abstractmethod
+    async def get_mcp_api_key(self) -> str | None:
+        """Get an MCP API Key."""
+
 
 class UserContextInjector(DiscriminatedUnionMixin, Injector[UserContext], ABC):
     """Injector for user contexts."""