feat(backend): Phase 0 项目骨架完成 — 后端/前端/数据库/Docker

- 后端：FastAPI + SQLAlchemy + Alembic，7 张核心表迁移成功
- 前端：Next.js 16 + TailwindCSS 4 + 三端布局（投资人/创始人/Admin）
- 数据库：PostgreSQL 16，7 张核心实体表（tenants/users/companies/monthly_reports/health_scores/risk_events/audit_logs）
- Docker：docker-compose.yml + 前后端 Dockerfile
- 测试：健康检查 4 个测试全部 GREEN
- 文档：README/run.md/AGENTS.md/docs 体系完整

frontend/Dockerfile

@@ -0,0 +1,21 @@
+FROM node:22-alpine AS builder
+
+WORKDIR /app
+
+COPY package.json pnpm-lock.yaml ./
+RUN npm install -g pnpm && pnpm install --frozen-lockfile
+
+COPY . .
+RUN pnpm build
+
+FROM node:22-alpine AS runner
+
+WORKDIR /app
+
+COPY --from=builder /app/.next/standalone ./
+COPY --from=builder /app/.next/static ./.next/static
+COPY --from=builder /app/public ./public
+
+EXPOSE 3000
+
+CMD ["node", "server.js"]