完善：完善用户登录 API，优化部分包结构（引入 MyBatis Plus、多数据源、P6Spy、Liquibase 等依赖，详情可见 README 介绍）

continew-admin-common/src/main/java/top/charles7c/cnadmin/common/exception/ServiceException.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2022-present Charles7c Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package top.charles7c.cnadmin.common.exception;
+
+import lombok.NoArgsConstructor;
+
+/**
+ * 业务异常
+ *
+ * @author Charles7c
+ * @since 2022/12/23 22:55
+ */
+@NoArgsConstructor
+public class ServiceException extends RuntimeException {
+
+    public ServiceException(String message) {
+        super(message);
+    }
+
+}