fix(postgres): 增加 max_wal_senders 到 10 支持更多 CDC connector

- max_replication_slots: 4 -> 10
- max_wal_senders: 4 -> 10
- 修复 authorization-connector FAILED 的问题

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/services/docker-compose.yml

@@ -32,9 +32,9 @@ services:
       - "-c"
       - "wal_level=logical"
       - "-c"
-      - "max_replication_slots=4"
+      - "max_replication_slots=10"
       - "-c"
-      - "max_wal_senders=4"
+      - "max_wal_senders=10"
     healthcheck:
       test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-rwa_user}"]
       interval: 5s