chore: Update plugin catalog schema

[johnnygreco]

Summary

Updates ddp catalog so the generated plugin catalog reflects installed local Data Designer plugin registrations and runtime metadata.

What changed

• Emit catalog rows with columns: Plugin Package, Version, Name, Type, and Description.
• Load local plugin registrations and derive Name from Plugin.name and Type from Plugin.plugin_type.value.
• Keep package-level [project].description as the catalog description source until DataDesigner exposes plugin-level descriptions.
• Add clear catalog errors when a registration is missing, cannot load, or does not load to a DataDesigner Plugin object.
• Update docs to explain catalog generation and the make sync requirement.
• Regenerate docs/catalog.md with the new schema.

Validation

• make sync
• make catalog
• make lint
• make test
• make validate
• make check
• uv run pytest devtools/ddp/tests -v