feat(tenant): 添加租户名称重复验证

- 在创建租户时检查名称是否已存在
- 确保租户名称不为空
- 防止重复租户名称导致的数据冲突

src/main/resources/application-dev.yml

@@ -5,14 +5,14 @@ spring:
   main:
     allow-circular-references: true
   datasource:
-    url: jdbc:mysql://132.232.214.96:13306/gxwebsoft_core?useSSL=false&serverTimezone=UTC
+    url: jdbc:mysql://47.119.165.234:13308/gxwebsoft_core?useSSL=false&serverTimezone=UTC
     username: gxwebsoft_core
     password: jdj7HYEdYHnYEFBy
     driver-class-name: com.mysql.cj.jdbc.Driver
     type: com.alibaba.druid.pool.DruidDataSource
   redis:
     database: 0
-    host: 132.232.214.96
+    host: 47.119.165.234
     port: 16379
     password: redis_WSDb88