feat: 重构 Docker 配置结构，添加 compute 模块及新增文档

- 将 Dockerfile 和 docker-compose.yml 迁移至 docker/ 目录下统一管理
- 新增 compute 计算模块（API 入口、依赖配置）
- 新增 docker/app 和 docker/compute 部署配置
- 新增 demo-development-plan.md 演示开发计划文档
- 更新后端 API 设计、部署计划、架构需求等文档
- 更新 postgres 数据库 schema

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

docker/compute/docker-compose.yml

@@ -0,0 +1,41 @@
+services:
+  compute-api:
+    build:
+      context: ../..
+      dockerfile: docker/compute/Dockerfile.compute
+    image: yg-ft-compute-api:latest
+    container_name: yg-ft-compute-api
+    gpus: all
+    ports:
+      - "${COMPUTE_API_PORT:-9100}:9100"
+    environment:
+      COMPUTE_ENV: ${COMPUTE_ENV:-prod}
+      COMPUTE_HOST_ID: ${COMPUTE_HOST_ID:-gpu-node-01}
+      COMPUTE_SERVICE_TOKEN: ${COMPUTE_SERVICE_TOKEN:-change_me}
+      ENABLE_APP_CALLBACK: ${ENABLE_APP_CALLBACK:-false}
+      LLAMA_FACTORY_HOME: ${LLAMA_FACTORY_HOME:-/opt/LLaMA-Factory}
+      YG_FT_DATA_ROOT: ${YG_FT_DATA_ROOT:-/data/yg-ft}
+      LOG_DIR: ${LOG_DIR:-/opt/yg-ft/logs/compute}
+      CUDA_VISIBLE_DEVICES: ${CUDA_VISIBLE_DEVICES:-all}
+      NVIDIA_VISIBLE_DEVICES: ${NVIDIA_VISIBLE_DEVICES:-all}
+      NVIDIA_DRIVER_CAPABILITIES: ${NVIDIA_DRIVER_CAPABILITIES:-compute,utility}
+      PYTHONPATH: /app
+    volumes:
+      - ../../compute:/app/compute:ro
+      - ${LLAMA_FACTORY_HOST_PATH:-/opt/LLaMA-Factory}:${LLAMA_FACTORY_HOME:-/opt/LLaMA-Factory}
+      - ${YG_FT_DATA_ROOT_HOST:-/data/yg-ft}:${YG_FT_DATA_ROOT:-/data/yg-ft}
+      - ../../runtime/compute/logs:/opt/yg-ft/logs/compute
+      - ../../runtime/compute/training-logs:/opt/yg-ft/logs/training
+    networks:
+      - yg-ft-compute
+    healthcheck:
+      test: ["CMD-SHELL", "python -c \"import urllib.request; urllib.request.urlopen('http://127.0.0.1:9100/health', timeout=3).read()\""]
+      interval: 30s
+      timeout: 5s
+      retries: 3
+      start_period: 20s
+    restart: unless-stopped
+
+networks:
+  yg-ft-compute:
+    name: yg-ft-compute