Add lib/api/routes/projects.js: list by space (with status filter),
create scoped to space, get/patch/delete by id. FK violation from
unknown space_id maps to 400 invalid_space.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Add lib/api/routes/spaces.js: list, create, get-by-id, get-by-slug,
patch, delete. Mounted under /api/spaces. Server smoke restored.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>