feat(wm-revenue): #55 客服知识库+公告板+KPI看板完整实现

- Entity: KbArticle(知识库文章), Announcement(公告), KpiDashboard(KPI看板VO)
- Mapper: KbArticleMapper, AnnouncementMapper (MyBatis-Plus)
- Service: KnowledgeBaseService(知识库CRUD+搜索+分类+点赞+热门),
           AnnouncementService(公告发布/编辑/按类型筛选/按范围推送/撤回),
           KpiService(KPI聚合计算:待处理量/时效/满意率/趋势/排行)
- Controller: CsSupportController (/api/revenue/cs/*)
- SQL DDL: V_cs_support.sql (cs_kb_article + cs_announcement 表+示例数据)
- Frontend: KnowledgeBaseView.vue(列表/卡片/Markdown编辑器),
            AnnouncementView.vue(类型标签/状态切换/时间范围),
            KpiDashboardView.vue(ECharts趋势图+饼图+排行)
- Unit Test: CsSupportServiceTest (知识库/公告/KPI三组测试)
- Router: 新增 /cs/knowledge, /cs/announcement, /cs/kpi 路由

wm-production/pom.xml

@@ -12,5 +12,8 @@
         <dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-spring-boot3-starter</artifactId></dependency>
         <dependency><groupId>cn.dev33</groupId><artifactId>sa-token-spring-boot3-starter</artifactId></dependency>
         <dependency><groupId>org.postgresql</groupId><artifactId>postgresql</artifactId></dependency>
+        <dependency><groupId>com.alibaba</groupId><artifactId>easyexcel</artifactId></dependency>
+        <dependency><groupId>com.github.xiaoymin</groupId><artifactId>knife4j-openapi3-jakarta-spring-boot-starter</artifactId></dependency>
+        <dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency>
     </dependencies>
 </project>