fix(debezium): 统一 mining-wallet-outbox-connector 数据库名称

将 database.dbname 从 mining_wallet_db 改为 rwa_mining_wallet，
与 docker-compose.2.0.yml 和 deploy-mining.sh 保持一致。

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

backend/services/scripts/debezium/mining-wallet-outbox-connector.json

@@ -8,7 +8,7 @@
     "database.port": "5432",
     "database.user": "${POSTGRES_USER:-rwa_user}",
     "database.password": "${POSTGRES_PASSWORD:-rwa_secure_password}",
-    "database.dbname": "mining_wallet_db",
+    "database.dbname": "rwa_mining_wallet",
 
     "topic.prefix": "cdc.mining-wallet",