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/debezium/register-outbox-connectors.sh

@@ -0,0 +1,98 @@
+#!/bin/bash
+# Debezium Outbox Connectors 注册脚本（v2.1 M0.5）
+#
+# 功能：
+# - 向 Debezium Connect 注册 outbox 表的 CDC connector
+# - 监听 next_edu_cloud 数据库的 4 张 outbox 表
+# - 使用 ExtractNewRecordState SMT 简化事件格式
+# - 使用 TopicRouter SMT 根据 event_type 字段路由到业务 topic
+#
+# 使用：
+#   bash infra/debezium/register-outbox-connectors.sh
+#
+# 前置条件：
+# - Debezium Connect 已启动（端口 8083）
+# - MySQL binlog 已启用（row mode）
+# - outbox 表已存在
+#
+# v2.1 设计（见 §5.4 / §6.1 / ADR-032）：
+# - 业务代码只写业务表 + Outbox 表（事务内原子）
+# - Debezium 监听 binlog 自动投递（Transaction Log Tailing）
+# - 废弃 OutboxPublisher 轮询线程
+# - 保证 at-least-once 语义（Debezium offset 管理）
+
+set -euo pipefail
+
+DEBEZIUM_HOST="${DEBEZIUM_HOST:-localhost}"
+DEBEZIUM_PORT="${DEBEZIUM_PORT:-8083}"
+DEBEZIUM_URL="http://${DEBEZIUM_HOST}:${DEBEZIUM_PORT}"
+
+MYSQL_HOST="${MYSQL_HOST:-edu-mysql}"
+MYSQL_PORT="${MYSQL_PORT:-3306}"
+MYSQL_USER="${MYSQL_USER:-debezium}"
+MYSQL_PASSWORD="${MYSQL_PASSWORD:-debezium}"
+
+CONNECTORS_DIR="$(dirname "$0")/connectors"
+
+echo "=== Debezium Outbox Connector 注册（v2.1） ==="
+echo "目标：${DEBEZIUM_URL}"
+echo "MySQL：${MYSQL_HOST}:${MYSQL_PORT}"
+echo ""
+
+# 等待 Debezium Connect 就绪
+echo "等待 Debezium Connect 就绪..."
+for i in $(seq 1 30); do
+  if curl -sf "${DEBEZIUM_URL}/connectors" > /dev/null 2>&1; then
+    echo "✓ Debezium Connect 就绪"
+    break
+  fi
+  echo "  尝试 ${i}/30..."
+  sleep 2
+done
+
+# 注册所有 connector
+for connector_file in "${CONNECTORS_DIR}"/*.json; do
+  if [ ! -f "$connector_file" ]; then
+    echo "⚠ 无 connector 配置文件"
+    exit 0
+  fi
+
+  connector_name=$(basename "$connector_file" .json)
+  echo ""
+  echo "注册 connector: ${connector_name}"
+
+  # 替换占位符为环境变量值
+  config_payload=$(sed \
+    -e "s|MYSQL_HOST_PLACEHOLDER|${MYSQL_HOST}|g" \
+    -e "s|MYSQL_PORT_PLACEHOLDER|${MYSQL_PORT}|g" \
+    -e "s|MYSQL_USER_PLACEHOLDER|${MYSQL_USER}|g" \
+    -e "s|MYSQL_PASSWORD_PLACEHOLDER|${MYSQL_PASSWORD}|g" \
+    "$connector_file")
+
+  # 检查是否已存在
+  if curl -sf "${DEBEZIUM_URL}/connectors/${connector_name}" > /dev/null 2>&1; then
+    echo "  ⚠ 已存在，更新配置..."
+    echo "$config_payload" | curl -sX PUT "${DEBEZIUM_URL}/connectors/${connector_name}/config" \
+      -H "Content-Type: application/json" \
+      -d @- | jq .
+  else
+    # 包装为创建请求
+    payload=$(jq -n --arg name "$connector_name" --argjson config "$config_payload" \
+      '{name: $name, config: $config}')
+    echo "$payload" | curl -sX POST "${DEBEZIUM_URL}/connectors" \
+      -H "Content-Type: application/json" \
+      -d @- | jq .
+  fi
+
+  echo "  ✓ ${connector_name} 已注册"
+done
+
+echo ""
+echo "=== 注册完成 ==="
+echo ""
+echo "查看 connector 状态："
+echo "  curl ${DEBEZIUM_URL}/connectors"
+echo "  curl ${DEBEZIUM_URL}/connectors/<name>/status"
+echo ""
+echo "删除 connector："
+echo "  curl -X DELETE ${DEBEZIUM_URL}/connectors/<name>"