chore: Docker/Nginx 部署产物与 1Panel 指南

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

server/.dockerignore

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+.venv/
+db.sqlite3
+__pycache__/
+.cache/
+.pytest_cache/
+tracker/data/*.xdb

server/Dockerfile

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+FROM python:3.12-slim
+WORKDIR /app
+# 先只拷 requirements 加装依赖层，业务代码改动不触发重装
+COPY requirements.txt .
+# 大陆网络备用源：清华 pypi 镜像
+RUN pip install --no-cache-dir -r requirements.txt -i https://pypi.tuna.tsinghua.edu.cn/simple
+COPY . .
+EXPOSE 8000
+# 启动即 migrate（单副本场景简单可靠），随后 gunicorn 3 worker
+# --forwarded-allow-ips=*：信任前置 Nginx 传入的 X-Forwarded-For（DRF NUM_PROXIES=1 取末段还原客户端 IP）
+CMD ["sh", "-c", "python manage.py migrate && gunicorn config.wsgi:application -b 0.0.0.0:8000 -w 3 --forwarded-allow-ips=*"]