Add environment variable example and update .gitignore

- Created a new .env.example file to provide a template for environment variables, including database connection details, JWT settings, encryption keys, and external API keys.
- Updated .gitignore to include additional test output directories and archive files, ensuring that unnecessary files are not tracked by Git.
- Removed outdated approval test reports and scripts that are no longer needed, streamlining the project structure.

These changes improve the clarity of environment configuration and maintain a cleaner repository.

docker/deploy/docker-compose.yml

@@ -12,15 +12,15 @@ services:
       NODE_ENV: production
       PORT: "3001"
       HOST: 0.0.0.0
-      DATABASE_URL: postgresql://postgres:vexplor0909!!@211.115.91.141:11134/vexplor
-      JWT_SECRET: ilshin-plm-super-secret-jwt-key-2024
-      JWT_EXPIRES_IN: 24h
-      CORS_ORIGIN: https://v1.vexplor.com,https://api.vexplor.com
+      DATABASE_URL: ${DATABASE_URL}
+      JWT_SECRET: ${JWT_SECRET}
+      JWT_EXPIRES_IN: ${JWT_EXPIRES_IN:-24h}
+      CORS_ORIGIN: ${CORS_ORIGIN:-https://v1.vexplor.com,https://api.vexplor.com}
       CORS_CREDENTIALS: "true"
       LOG_LEVEL: info
-      ENCRYPTION_KEY: ilshin-plm-mail-encryption-key-32characters-2024-secure
-      KMA_API_KEY: ogdXr2e9T4iHV69nvV-IwA
-      ITS_API_KEY: d6b9befec3114d648284674b8fddcc32
+      ENCRYPTION_KEY: ${ENCRYPTION_KEY}
+      KMA_API_KEY: ${KMA_API_KEY}
+      ITS_API_KEY: ${ITS_API_KEY}
       EXPRESSWAY_API_KEY: ${EXPRESSWAY_API_KEY:-}
     volumes:
       - backend_uploads:/app/uploads