feat(infra): proto-to-graphql generator + debezium outbox connector

- M0: parse proto to generate Federation 2 subgraph SDL

- M0.5: Debezium Connect monitors 4 outbox tables

- docker-compose: extend Debezium profiles to default+p3+p4+p5+p6

- package.json: add proto:gen-graphql script

infra/docker-compose.yml

@@ -136,14 +136,16 @@ services:
       - "16686:16686"
       - "4318:4318"
   # ============================================================
-  # Debezium Connect - CDC 链路核心
+  # Debezium Connect - CDC 链路核心（v2.1：Outbox 表监听 + 自动投递）
   # 监听 MySQL binlog → 写入 Kafka topic
-  # topic 命名约定：<prefix>.<database>.<table>（如 edu-cdc.next_edu_cloud.grades）
+  # v2.1 设计（ADR-032）：业务代码只写 outbox 表，Debezium 监听 binlog 自动投递
+  # 废弃 OutboxPublisher 轮询线程（见 M0.5 / M8）
+  # 注册脚本：bash infra/debezium/register-outbox-connectors.sh
   # ============================================================
   debezium-connect:
     image: quay.io/debezium/connect:2.7
     container_name: edu-debezium
-    profiles: ["p4", "p5", "p6"]
+    profiles: ["default", "p3", "p4", "p5", "p6"]
     restart: unless-stopped
     depends_on:
       kafka: