fix(community): getDetail 返回 isFollowed 字段，修复关注状态不持久（test-0415 反馈5-1）

- 此前仅回传 isLiked / isCollected，缺少 isFollowed
- 用户每次进入帖子页都显示「+ 关注」，重复点击导致 follow/unfollow 反复无感知
- 同时补全未登录场景的 isLiked/isCollected/isFollowed 默认 false

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

msh_crmeb_22/crmeb-service/src/main/java/com/zbkj/service/service/impl/tool/ToolCommunityServiceImpl.java

@@ -372,6 +372,16 @@ public class ToolCommunityServiceImpl implements ToolCommunityService {
                     .eq(V2CommunityInteraction::getPostId, post.getPostId())
                     .eq(V2CommunityInteraction::getInteractionType, "collect");
              map.put("isCollected", v2CommunityInteractionDao.selectCount(collectLqw) > 0);
+
+             // test-0415 反馈5-1：关注状态需回传，避免再次进入页面后按钮回到「+ 关注」
+             LambdaQueryWrapper<V2CommunityFollow> followLqw = new LambdaQueryWrapper<>();
+             followLqw.eq(V2CommunityFollow::getFollowerId, userId.longValue())
+                      .eq(V2CommunityFollow::getFolloweeId, post.getUserId());
+             map.put("isFollowed", v2CommunityFollowDao.selectCount(followLqw) > 0);
+        } else {
+             map.put("isLiked", false);
+             map.put("isCollected", false);
+             map.put("isFollowed", false);
         }
 
         return map;