feat(deploy): 完成 Phase 3 优化与测试

- T-013 错误处理: 增强 API 错误处理，添加日志记录
- T-015 视频链接: 已在 ResultTable 中实现点击跳转
- T-016 部署配置: 添加前后端 Dockerfile 和 docker-compose.yml
- 新增 11 个错误处理测试用例，共 55 个测试全部通过
- 测试覆盖率达到 93%

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/Dockerfile

@@ -0,0 +1,41 @@
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+# Install pnpm
+RUN corepack enable && corepack prepare pnpm@latest --activate
+
+# Copy package files
+COPY package.json pnpm-lock.yaml ./
+
+# Install dependencies
+RUN pnpm install --frozen-lockfile
+
+# Copy application code
+COPY . .
+
+# Build application
+RUN pnpm build
+
+# Production image
+FROM node:20-alpine AS runner
+
+WORKDIR /app
+
+# Create non-root user
+RUN addgroup --system --gid 1001 nodejs
+RUN adduser --system --uid 1001 nextjs
+
+# Copy built files
+COPY --from=builder /app/public ./public
+COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
+COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+
+USER nextjs
+
+EXPOSE 3000
+
+ENV PORT 3000
+ENV HOSTNAME "0.0.0.0"
+
+CMD ["node", "server.js"]

frontend/next.config.mjs

@@ -1,4 +1,6 @@
 /** @type {import('next').NextConfig} */
-const nextConfig = {};
+const nextConfig = {
+  output: 'standalone',
+};
 
 export default nextConfig;