Michael Chus 3d222b7f14 feat: add ConnectionManager for lazy database connections ...

Introduced ConnectionManager to support offline-first architecture:

- New internal/db/connection.go with thread-safe connection management
- Lazy connection establishment (5s timeout, 10s cooldown)
- Automatic ping caching (30s interval) to avoid excessive checks
- Updated middleware/offline.go to use ConnectionManager.IsOnline()
- Updated sync/worker.go to use ConnectionManager instead of direct DB

This enables the application to start without MariaDB and gracefully
handle offline/online transitions.

Part of Phase 2.5: Full Offline Mode

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

2026-02-02 23:29:04 +03:00

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