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

docker-compose.prod.yml

@@ -8,6 +8,7 @@ services:
       - NODE_ENV=production
       - VITE_DEMO_MODE=${VITE_DEMO_MODE:-false}
       - VITE_API_URL=${VITE_API_URL:-http://localhost:8080}
+      - VITE_OAUTH_SERVICE_URL=${VITE_OAUTH_SERVICE_URL:-https://oauth.trackeep.org}
       - FRONTEND_PORT=${FRONTEND_PORT:-80}
       - BACKEND_PORT=${BACKEND_PORT:-8080}
     depends_on:
@@ -39,6 +40,8 @@ services:
       - DB_SSL_MODE=${DB_SSL_MODE:-disable}
       - JWT_SECRET=${JWT_SECRET}
       - JWT_EXPIRES_IN=${JWT_EXPIRES_IN:-24h}
+      - FRONTEND_URL=${FRONTEND_URL:-http://localhost}
+      - OAUTH_SERVICE_URL=${OAUTH_SERVICE_URL:-https://oauth.trackeep.org}
       - UPLOAD_DIR=${UPLOAD_DIR:-./uploads}
       - MAX_FILE_SIZE=${MAX_FILE_SIZE:-10485760}
       - 'CORS_ALLOWED_ORIGINS=${CORS_ALLOWED_ORIGINS:-*}'