build: 构建生产版本

**前端构建:**
- Flutter Web 构建产物 (build/web)
- 包含主题修复和绿色对比度优化

**后端修改:**
- 添加 MyBatisPlusMetaObjectHandler (自动填充字段)
- 更新实体类、DTO、Controller
- 优化 Jackson 配置
- 更新 application-dev.yml

**构建信息:**
- Maven: monisuo-1.0.jar (41MB)
- Flutter: build/web (22.9s)
- 环境: prod

flutter_monisuo/build/web/flutter_bootstrap.js

@@ -37,6 +37,6 @@ _flutter.buildConfig = {"engineRevision":"e4b8dca3f1b4ede4c30371002441c88c12187e
 
 _flutter.loader.load({
   serviceWorkerSettings: {
-    serviceWorkerVersion: "3108218853" /* Flutter's service worker is deprecated and will be removed in a future Flutter release. */
+    serviceWorkerVersion: "1528833849" /* Flutter's service worker is deprecated and will be removed in a future Flutter release. */
   }
 });