feat: migrate to DragonflyDB and clean up environment configuration

- Replace Redis with DragonflyDB for better performance and memory efficiency
- Remove redundant environment variables (POSTGRES_*, ENCRYPTION_KEY, OAUTH_SERVICE_URL)
- Consolidate database configuration to use single DB_* variables
- Use JWT_SECRET for both JWT tokens and encryption
- Remove PORT variable redundancy, use BACKEND_PORT consistently
- Clean up docker-compose configurations for dev/prod consistency
- Add DragonflyDB configuration with optimized memory usage
- Remove redis.conf as it's no longer needed
- Update health checks to use Redis-compatible CLI for DragonflyDB
- Add missing VITE_API_URL to production frontend
- Fix GitHub Actions to use correct go.sum path
- Clean up development directories and unused files

backend/models/models.go

@@ -63,6 +63,9 @@ func AutoMigrate() {
 		&Integration{},
 		&SyncLog{},
 		&WebhookEvent{},
+		&GitHubAppInstallState{},
+		&GitHubAppInstallation{},
+		&GitHubRepoBackup{},
 		// Analytics models
 		&Analytics{},
 		&ProductivityMetrics{},