feat: 提交 Docker 环境配置文件，更新 .gitignore 规则

- 新增 docker/app/.env 应用环境配置
- 新增 docker/compute/.env 计算节点环境配置
- 更新 .gitignore 允许提交 .env 配置文件

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

docker/app/.env

@@ -0,0 +1,46 @@
+APP_ENV=prod
+APP_NAME=YG Fine-Tune Platform API
+MODELTF_ROUTE_PREFIX=/modelTF
+CORS_ALLOW_ORIGINS=http://localhost:16801,http://127.0.0.1:16801
+
+FRONTEND_IMAGE=yg-ft-frontend-runtime:latest
+BACKEND_API_IMAGE=yg-ft-backend-api:latest
+
+# Five-digit host ports exposed outside the application server.
+FRONTEND_PORT=16801
+BACKEND_API_PORT=17861
+POSTGRES_PORT=15432
+REDIS_PORT=16379
+
+POSTGRES_DB=yg_ft
+POSTGRES_USER=root
+POSTGRES_PASSWORD=8811614287327Leo
+DATABASE_URL=postgresql+psycopg://root:8811614287327Leo@www.caoxiaozhu.com:5432/yg_ft
+
+REDIS_URL=redis://redis:6379/0
+
+# PostgreSQL uses the shared external database. The local postgres service is disabled in docker-compose.yml.
+# Redis still uses the built-in service during current development.
+USE_BUILTIN_POSTGRES=false
+USE_BUILTIN_REDIS=true
+
+LOG_LEVEL=INFO
+LOG_DIR=/opt/yg-ft/logs/backend
+LOG_FILE_PREFIX=backend
+LOG_ERROR_FILE_PREFIX=error
+LOG_MAX_BYTES=20971520
+LOG_RETENTION_DAYS=10
+
+BACKEND_PROXY_PASS=http://backend-api:8000
+
+# Split deployment: set these to the compute server address, for example http://10.10.20.31:19100.
+COMPUTE_API_BASE_URL=http://compute-api:9100
+COMPUTE_SERVICE_TOKEN=change_me
+FILE_GATEWAY_BASE_URL=http://compute-api:9101
+
+# The application side polls Compute API for job state to avoid opening reverse network access.
+COMPUTE_MODE=real
+COMPUTE_STATUS_SYNC_MODE=polling
+COMPUTE_POLL_INTERVAL_SECONDS=10
+COMPUTE_POLL_BATCH_SIZE=100
+COMPUTE_REQUEST_TIMEOUT_SECONDS=5