feat: Enhance tool management and documentation in Castle

- Introduced category tools support in the `castle create` command.
- Added detailed guides for creating components in CLAUDE.md.
- Implemented new API endpoints for listing and retrieving tool details.
- Updated component and tool models to include additional metadata.
- Improved error handling and response structures in service actions.
- Enhanced documentation for component registry and web APIs.

docs/web-frontends.md

@@ -156,6 +156,9 @@ components:
 This gives the component both the `frontend` role (from `build`) and the
 `service` role (from `expose.http`) during development.
 
+See @docs/component-registry.md for the full manifest reference and role
+derivation rules.
+
 ## Serving with Caddy
 
 For production, serve the static `dist/` output directly from Caddy rather than