Michael Chus c024b96de7 fix: enable instant startup and offline mode for server ...

Fixed two critical issues preventing offline-first operation:

1. **Instant startup** - Removed blocking GetDB() call during server
   initialization. Server now starts in <10ms instead of 1+ minute.
   - Changed setupRouter() to use lazy DB connection via ConnectionManager
   - mariaDB connection is now nil on startup, established only when needed
   - Fixes timeout issues when MariaDB is unreachable

2. **Offline mode nil pointer panics** - Added graceful degradation
   when database is offline:
   - ComponentService.GetCategories() returns DefaultCategories if repo is nil
   - ComponentService.List/GetByLotName checks for nil repo
   - PricelistService methods return empty/error responses in offline mode
   - All methods properly handle nil repositories

**Before**: Server startup took 1min+ and crashed with nil pointer panic
when trying to load /configurator page offline.

**After**: Server starts instantly and serves pages in offline mode using
DefaultCategories and SQLite data.

Related to Phase 2.5: Full Offline Mode (local-first architecture)

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

2026-02-02 23:28:14 +03:00

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