refactor(api): restructure auth endpoints with DTO validation and unified response

- Add Result<T> generic response template for standardized API output
- Introduce UserLoginDTO with validation annotations for login requests
- Migrate AuthController to use DTO binding and return Result responses
- Update AuthService interface to accept UserLoginDTO and return Boolean
- Add Jackson configuration (snake_case, non-null, date format)
- Include jackson-module-kotlin and spring-boot-starter-validation deps

src/main/resources/application.yaml

@@ -8,10 +8,13 @@ spring:
     url: jdbc:${DB_TYPE}://${DB_URL}:${DB_PORT}/${DB_NAME}
     username: ${DB_USER}
     password: ${DB_PASSWORD}
+  jackson:
+    default-property-inclusion: non_null
+    property-naming-strategy: SNAKE_CASE
+    date-format: ${JSON_DATE_FORMAT}
+    time-zone: ${JSON_TIME_ZONE}
 
 mybatis-plus:
   configuration:
     # 开启驼峰命名法
-    map-underscore-to-camel-case: true
-    # 开启日志输出sql语句
-    log-impl: org.apache.ibatis.logging.commons.JakartaCommonsLoggingImpl
+    map-underscore-to-camel-case: true