Add Phase 2: Local SQLite database with sync functionality

Implements complete offline-first architecture with SQLite caching and MariaDB synchronization.

Key features:
- Local SQLite database for offline operation (data/quoteforge.db)
- Connection settings with encrypted credentials
- Component and pricelist caching with auto-sync
- Sync API endpoints (/api/sync/status, /components, /pricelists, /all)
- Real-time sync status indicator in UI with auto-refresh
- Offline mode detection middleware
- Migration tool for database initialization
- Setup wizard for initial configuration

New components:
- internal/localdb: SQLite repository layer (components, pricelists, sync)
- internal/services/sync: Synchronization service
- internal/handlers/sync: Sync API handlers
- internal/handlers/setup: Setup wizard handlers
- internal/middleware/offline: Offline detection
- cmd/migrate: Database migration tool

UI improvements:
- Setup page for database configuration
- Sync status indicator with online/offline detection
- Warning icons for pending synchronization
- Auto-refresh every 30 seconds

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

internal/repository/configuration.go

@@ -73,3 +73,18 @@ func (r *ConfigurationRepository) ListTemplates(offset, limit int) ([]models.Con
 
 	return configs, total, err
 }
+
+// ListAll returns all configurations without user filter
+func (r *ConfigurationRepository) ListAll(offset, limit int) ([]models.Configuration, int64, error) {
+	var configs []models.Configuration
+	var total int64
+
+	r.db.Model(&models.Configuration{}).Count(&total)
+	err := r.db.
+		Order("created_at DESC").
+		Offset(offset).
+		Limit(limit).
+		Find(&configs).Error
+
+	return configs, total, err
+}