- Add express-pouchdb for self-hosted PouchDB sync server
- Public databases (/db/public/:db) accessible without auth
- Add auth middleware for public/private database access
- Simplify share button to copy current URL to clipboard
- Move feature config from static JSON to dynamic API endpoint
- Add PouchDB sync to PouchData class for real-time collaboration
- Fix Express 5 compatibility by patching req.query
- Skip express.json() for /pouchdb routes (stream handling)
- Remove unused PouchdbPersistenceManager and old share system
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
