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Michael Chus d7285fc730 fix: prevent PricingHandler panics in offline mode

**Problem:**
Opening /admin/pricing page caused nil pointer panic when offline
because PricingHandler methods accessed nil repositories.

**Solution:**
Added offline checks to all PricingHandler public methods:

1. **GetStats** - returns empty stats with offline flag
2. **ListComponents** - returns empty list with message
3. **GetComponentPricing** - returns 503 with offline error
4. **UpdatePrice** - blocks mutations with offline error
5. **RecalculateAll** - blocks recalculation with offline error
6. **PreviewPrice** - blocks preview with offline error

**Response format:**
```json
{
  "offline": true,
  "message": "Управление ценами доступно только в онлайн режиме",
  "components": [],
  "total": 0
}
```

**Impact:**
- ✅ No panics when viewing admin pricing offline
- ✅ Clear offline status indication
- ✅ Graceful degradation for all operations
- ✅ UI can detect offline and show appropriate message

Fixes Phase 2.5 admin panel offline issue.

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

2026-02-03 07:17:58 +03:00