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/docker-compose.minimal.yml

@@ -0,0 +1,40 @@
+name: edu-minimal
+services:
+  mysql:
+    image: mysql:8.0
+    container_name: edu-mysql
+    restart: unless-stopped
+    environment:
+      MYSQL_ROOT_PASSWORD: ${MYSQL_ROOT_PASSWORD:-changeme}
+      MYSQL_DATABASE: ${MYSQL_DATABASE:-next_edu_cloud}
+      MYSQL_USER: ${MYSQL_USER:-edu}
+      MYSQL_PASSWORD: ${MYSQL_PASSWORD:-changeme}
+    ports:
+      - "3306:3306"
+    volumes:
+      - mysql_data:/var/lib/mysql
+      - ./init-sql:/docker-entrypoint-initdb.d:ro
+    healthcheck:
+      test: ["CMD", "mysqladmin", "ping", "-h", "localhost", "-u", "root", "-p${MYSQL_ROOT_PASSWORD:-changeme}"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+  redis:
+    image: redis:7-alpine
+    container_name: edu-redis
+    restart: unless-stopped
+    ports:
+      - "6379:6379"
+    command: redis-server --appendonly yes
+    volumes:
+      - redis_data:/data
+    healthcheck:
+      test: ["CMD", "redis-cli", "ping"]
+      interval: 10s
+      timeout: 3s
+      retries: 5
+
+volumes:
+  mysql_data:
+  redis_data: