fix: 修改信用卡管理，可用额度改为必填。

src/views/invest/creditcard/index.vue

@@ -164,8 +164,8 @@ const data = reactive({
     billDate: [{ required: true, message: '账单日不能为空', trigger: 'blur' }],
     payDate: [{ required: true, message: '还款日不能为空', trigger: 'blur' }],
     creditLimit: [{ required: true, message: '信用卡额度不能为空', trigger: 'blur' }],
-    balance: [{ required: true, message: '余额不能为空', trigger: 'blur' }]
-    // cvv: [{ required: true, message: '信用卡安全码不能为空', trigger: 'blur' }]
+    balance: [{ required: true, message: '余额不能为空', trigger: 'blur' }],
+    availableLimit: [{ required: true, message: '可用额度不能为空', trigger: 'blur' }]
   }
 })