feat(p1): complete P1 foundation stage

- monorepo: pnpm workspace + go.work + pyproject.toml + commitlint/husky
- infra: docker-compose (minimal + full profiles) + init-sql + prometheus
- arch-scan: multi-language scanner skeleton (TS/Go/Python/Proto)
- shared-proto: buf v2 + classes.proto (ClassService CRUD contract)
- api-gateway: Go/Gin + JWT HS256 auth + reverse proxy + request ID
- classes: NestJS golden template (error system + observability + middleware + CRUD + tests)
- teacher-portal: Next.js + paper-feel UI design system
- CI/CD: 4 workflows (go/ts/py/proto)
- docs: migration guide + project_rules + coding-standards + git-workflow + ui-design-system + 004 + 9 module READMEs + known-issues + spec/plan migration + roadmap

README.md

@@ -0,0 +1,52 @@
+# Next Edu Cloud
+
+基于 DDD + EDA + CQRS 的企业级微服务架构教育云平台。
+
+## 技术栈
+
+- **网关层**: Go (Gin)
+- **业务服务**: TypeScript (NestJS)
+- **分析/AI**: Python (FastAPI)
+- **前端**: React (Next.js + Module Federation)
+- **存储**: MySQL / Redis / ClickHouse / Neo4j / Elasticsearch
+- **事件总线**: Kafka + Debezium CDC
+- **契约**: protobuf + buf
+
+## 快速开始
+
+```bash
+# 1. 安装依赖
+pnpm install
+
+# 2. 启动最小基础设施（MySQL + Redis）
+docker compose -f infra/docker-compose.minimal.yml up -d
+
+# 3. 复制环境变量
+cp .env.example .env
+
+# 4. 运行 arch.db 扫描
+pnpm run arch:scan
+
+# 5. 启动服务
+pnpm dev
+```
+
+## 文档
+
+- [架构设计](docs/architecture/004_architecture_impact_map.md)
+- [理想蓝图](docs/architecture/0010_architecture.md)
+- [编码规范](docs/standards/coding-standards.md)
+- [UI 设计系统](docs/standards/ui-design-system.md)
+- [Git 工作流](docs/standards/git-workflow.md)
+- [已知问题](docs/troubleshooting/known-issues.md)
+- [项目规则](project_rules.md)
+- [迁移指南](MIGRATION_GUIDE.md)
+
+## 开发阶段
+
+- **P1 地基** (M1-M3): 仓库骨架 + 基础设施 + classes 黄金模板
+- **P2 身份** (M4-M6): IAM 服务 + Teacher BFF + 微前端骨架
+- **P3 核心教学** (M7-M10): CoreEdu + Outbox + 考试/作业/成绩
+- **P4 内容分析** (M11-M13): Content + DataAna + CDC
+- **P5 沟通AI** (M14-M16): Msg + Push + AI + ES
+- **P6 硬化** (M17-M18): Service Mesh + 生产硬化