fix(elicitation): guard ctx=None in elicit_and_configure, cover all settings/docker/notifications actions

- setup.py: elicit_and_configure now accepts Context | None; returns False
  immediately when ctx is None instead of crashing with AttributeError
- settings.py: added CredentialsNotConfiguredError try/except guard around
  make_graphql_request calls in all 8 previously-unguarded actions
  (update_temperature, update_time, configure_ups, update_api, connect_sign_in,
  connect_sign_out, setup_remote_access, enable_dynamic_remote_access)
- docker.py: added guards to all 20 previously-unguarded make_graphql_request
  calls (details, logs, networks, network_details, port_conflicts, check_updates,
  restart, update_all, all 11 organizer mutations, and single-container fallback)
- notifications.py: added guards to all 11 previously-unguarded calls
  (list, warnings, create, archive/unread, delete, delete_archived, archive_all,
  archive_many, create_unique, unarchive_many, unarchive_all, recalculate)

unraid_mcp/core/setup.py

@@ -21,15 +21,26 @@ class _UnraidCredentials:
     api_key: str
 
 
-async def elicit_and_configure(ctx: Context) -> bool:
+async def elicit_and_configure(ctx: Context | None) -> bool:
     """Prompt the user for Unraid credentials via MCP elicitation.
 
     Writes accepted credentials to .env in PROJECT_ROOT and applies them
     to the running process via apply_runtime_config().
 
+    Args:
+        ctx: The MCP context for elicitation. If None, returns False immediately
+             (no context available to prompt the user).
+
     Returns:
         True if credentials were accepted and applied, False if declined/cancelled.
     """
+    if ctx is None:
+        logger.warning(
+            "Cannot elicit credentials: no MCP context available. "
+            "Run unraid_health action=setup to configure credentials."
+        )
+        return False
+
     result = await ctx.elicit(
         message=(
             "Unraid MCP needs your Unraid server credentials to connect.\n\n"