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/Dockerfile.compute

@@ -0,0 +1,37 @@
+# syntax=docker/dockerfile:1
+
+FROM nvidia/cuda:12.4.1-cudnn-runtime-ubuntu22.04
+
+ENV DEBIAN_FRONTEND=noninteractive \
+    PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    PIP_NO_CACHE_DIR=1
+
+WORKDIR /app
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+      python3 \
+      python3-pip \
+      python3-venv \
+      git \
+      curl \
+      ca-certificates \
+      tini \
+    && ln -sf /usr/bin/python3 /usr/local/bin/python \
+    && ln -sf /usr/bin/pip3 /usr/local/bin/pip \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY compute/requirements.txt /tmp/requirements.txt
+RUN pip install --upgrade pip \
+    && pip install -r /tmp/requirements.txt \
+    && rm -f /tmp/requirements.txt
+
+RUN mkdir -p /opt/yg-ft/logs/compute /opt/yg-ft/logs/training /data/yg-ft /opt/LLaMA-Factory \
+    && chmod -R 0775 /opt/yg-ft /data/yg-ft /opt/LLaMA-Factory
+
+ENTRYPOINT ["/usr/bin/tini", "--"]
+
+EXPOSE 9100
+
+CMD ["uvicorn", "compute.api.main:app", "--host", "0.0.0.0", "--port", "9100"]