* feat(mcp): add the official n8n server to the catalog
Connect to the user's instance over HTTP with browser OAuth. Keep a
separate n8n-official identifier so the retired n8n bridge is neither
relabeled nor overwritten and retains its credentials and tool filter.
Save ordinary catalog setup values in server config, retaining secret
references in .env. Pass field secrecy through the catalog API so URLs
and client IDs remain visible while credentials stay masked.
Keep the existing install-then-authorize lifecycle. Transactional setup
and cancellation changes are outside this catalog addition.
* refactor(mcp): limit n8n PR to catalog addition
Remove shared installer, storage, field-masking, and input-handler changes.
Those behaviors are being handled in a separate PR. Restore their tests
and Asana guidance to the base branch.
Keep only the official n8n manifest and setup documentation, using the
catalog's existing setup and persistence behavior.
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