init: 初始化 AssetX 项目仓库

包含 webapp（Next.js 用户端）、webapp-back（Go 后端）、
antdesign（管理后台）、landingpage（营销落地页）、
数据库 SQL 和配置文件。

webapp/Dockerfile

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+# ---- Build stage ----
+FROM node:20-alpine AS builder
+WORKDIR /app
+RUN apk add --no-cache python3 make g++
+COPY package.json package-lock.json* yarn.lock* pnpm-lock.yaml* ./
+RUN npm ci --legacy-peer-deps
+COPY . .
+ARG BACKEND_URL=http://backend:8080
+ENV BACKEND_URL=$BACKEND_URL
+RUN npm run build
+
+# ---- Run stage ----
+FROM node:20-alpine AS runner
+WORKDIR /app
+ENV NODE_ENV=production
+COPY --from=builder /app/.next/standalone ./
+COPY --from=builder /app/.next/static ./.next/static
+COPY --from=builder /app/public ./public
+EXPOSE 3010
+ENV BACKEND_URL=http://backend:8080
+CMD ["node", "server.js"]