feat: 将本地独有功能移植到 upstream 最新版本

基于 upstream/master (c5922f9) 新建分支，移植以下功能：
1. 扫码登录（DyQrCodeService + ConfigController 3个接口）
2. 视频预览组件（VideoPlayer.vue）
3. 下载配置服务（DownloadConfigService + AppConfig 6个扩展字段）
4. Gitea CI/CD（.gitea/workflows/deploy.yml）
5. 生产 Dockerfile（Dockerfile.prod，含中国镜像源配置）

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Dockerfile.prod

@@ -0,0 +1,86 @@
+# 多阶段构建 Dockerfile
+# 第一阶段：构建前端
+FROM node:18-alpine AS frontend-builder
+
+WORKDIR /app/frontend
+
+COPY app/package.json app/pnpm-lock.yaml* ./
+
+RUN npm config set registry https://registry.npmmirror.com && \
+    npm install -g pnpm && \
+    pnpm config set registry https://registry.npmmirror.com && \
+    if [ -f pnpm-lock.yaml ]; then \
+      pnpm install --frozen-lockfile; \
+    else \
+      npm install; \
+    fi
+
+COPY app/ ./
+RUN pnpm build || npm run build
+
+# 第二阶段：构建后端 + 下载 Playwright Chromium
+FROM mcr.azurecr.cn/dotnet/sdk:6.0 AS backend-builder
+
+WORKDIR /src
+
+# 安装 Node.js 18（用于 npx playwright install，最可靠的方式）
+RUN apt-get update && apt-get install -y curl && \
+    curl -fsSL https://deb.nodesource.com/setup_18.x | bash - && \
+    apt-get install -y nodejs && \
+    rm -rf /var/lib/apt/lists/*
+
+COPY *.csproj ./
+RUN dotnet restore dy.net.csproj
+
+COPY . .
+RUN find . -name "._*" -type f -delete
+
+COPY --from=frontend-builder /app/frontend/dist ./app/dist
+
+RUN dotnet publish dy.net.csproj -c Release -o /app/publish
+
+# 用 npx 下载 Playwright Chromium 到固定路径
+ENV PLAYWRIGHT_BROWSERS_PATH=/ms-playwright
+RUN npx -y playwright@1.44.0 install chromium
+
+# 第三阶段：运行镜像
+FROM mcr.azurecr.cn/dotnet/aspnet:6.0 AS final
+
+WORKDIR /app
+
+ENV TZ=Asia/Shanghai
+RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
+
+# 切换阿里云镜像源，解决国内网络无法访问 deb.debian.org 的问题
+RUN sed -i 's/deb.debian.org/mirrors.aliyun.com/g' /etc/apt/sources.list && \
+    sed -i 's/security.debian.org/mirrors.aliyun.com/g' /etc/apt/sources.list
+
+# 安装 Chromium 运行时依赖（Debian Bullseye）
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libnss3 \
+    libatk1.0-0 \
+    libatk-bridge2.0-0 \
+    libcups2 \
+    libdrm2 \
+    libxkbcommon0 \
+    libxcomposite1 \
+    libxdamage1 \
+    libxfixes3 \
+    libxrandr2 \
+    libgbm1 \
+    libasound2 \
+    libpango-1.0-0 \
+    libpangocairo-1.0-0 \
+    libgtk-3-0 \
+    fonts-liberation \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY --from=backend-builder /app/publish .
+COPY --from=backend-builder /ms-playwright /ms-playwright
+
+ENV PLAYWRIGHT_BROWSERS_PATH=/ms-playwright
+EXPOSE 10101
+ENV ASPNETCORE_URLS=http://*:10101
+ENV ASPNETCORE_ENVIRONMENT=Production
+
+ENTRYPOINT ["dotnet", "dy.net.dll"]