feat(student-bff): 完整实现 student-bff 聚合层

包含 src 全部实现、Dockerfile、shared-ts/bff 包等

services/student-bff/Dockerfile

@@ -0,0 +1,26 @@
+# Build stage (coord-final-decisions G1: 多阶段构建首次实现即用)
+FROM node:22-alpine AS builder
+WORKDIR /app
+RUN npm install -g pnpm
+COPY package.json pnpm-lock.yaml* ./
+# 复制 workspace 配置以解析 @edu/shared-ts 依赖
+COPY pnpm-workspace.yaml ./
+COPY packages/shared-ts ./packages/shared-ts
+COPY packages/shared-proto ./packages/shared-proto
+RUN pnpm install --frozen-lockfile
+COPY tsconfig.json nest-cli.json ./
+COPY src ./src
+RUN pnpm run build
+
+# Runtime stage
+FROM node:22-alpine
+WORKDIR /app
+RUN npm install -g pnpm
+COPY package.json pnpm-lock.yaml* ./
+COPY pnpm-workspace.yaml ./
+COPY packages/shared-ts ./packages/shared-ts
+COPY packages/shared-proto ./packages/shared-proto
+RUN pnpm install --prod --frozen-lockfile
+COPY --from=builder /app/dist ./dist
+EXPOSE 3009
+CMD ["node", "dist/main.js"]