chore(backend): 数据源切换到 JD Cloud MySQL 8 远端

原 192.168.16.251 已废弃。新地址
mysql-internet-cn-north-1-23feae22680e4dfa.rds.jdcloud.com:3306，
库名 zxyj（与本地同名），账号 cfc/cfc@1314。
main 与 sfms 两段 datasource 同步切换（sfms 默认 enabled=false）。

cfc-backend/src/main/resources/application.yml

@@ -16,9 +16,9 @@ spring:
     name: cfc-backend
   datasource:
     driver-class-name: com.mysql.cj.jdbc.Driver
-    url: jdbc:mysql://192.168.16.251:3306/zxyj?useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai&useSSL=false&allowPublicKeyRetrieval=true&createDatabaseIfNotExist=true
-    username: zxyj
-    password: zxyj@123
+    url: jdbc:mysql://mysql-internet-cn-north-1-23feae22680e4dfa.rds.jdcloud.com:3306/zxyj?useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai&useSSL=false&allowPublicKeyRetrieval=true&createDatabaseIfNotExist=true
+    username: cfc
+    password: cfc@1314
     hikari:
       maximum-pool-size: 50
       minimum-idle: 10
@@ -31,9 +31,9 @@ sfms:
   datasource:
     enabled: false  # 本地开发禁用 SFMS 数据源，需要迁移时改为 true
     driver-class-name: com.mysql.cj.jdbc.Driver
-    url: jdbc:mysql://192.168.16.251:3306/zxyj?useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai&useSSL=false&allowPublicKeyRetrieval=true&createDatabaseIfNotExist=true
-    username: zxyj
-    password: zxyj@123
+    url: jdbc:mysql://mysql-internet-cn-north-1-23feae22680e4dfa.rds.jdcloud.com:3306/zxyj?useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai&useSSL=false&allowPublicKeyRetrieval=true&createDatabaseIfNotExist=true
+    username: cfc
+    password: cfc@1314
 
 mybatis-plus:
   mapper-locations: classpath*:/mapper/**/*.xml