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

infra/init-sql/01-init.sql

@@ -0,0 +1,17 @@
+-- P1: classes 域 schema
+CREATE TABLE IF NOT EXISTS `classes` (
+  `id` CHAR(36) NOT NULL,
+  `name` VARCHAR(100) NOT NULL,
+  `grade_id` CHAR(36) NOT NULL,
+  `head_teacher_id` CHAR(36) NULL,
+  `description` TEXT NULL,
+  `created_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  `updated_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  PRIMARY KEY (`id`),
+  INDEX `idx_classes_grade_id` (`grade_id`),
+  INDEX `idx_classes_head_teacher` (`head_teacher_id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+-- P2 起增加 users / roles / permissions 表（IAM 服务）
+-- P3 起增加 exams / homework / grades 表（CoreEdu 服务）
+-- 各服务独立数据库或独立 schema，P1 先用同库不同表前缀