refactor: remove Gorse integration and implement HotRank feature

- Removed Gorse-related configurations, handlers, and dependencies from the codebase.
- Introduced HotRank feature with configuration options for ranking posts based on recent activity.
- Updated application structure to support HotRank processing, including new caching mechanisms and database interactions.
- Cleaned up related DTOs and repository methods to reflect the removal of Gorse and the addition of HotRank functionality.

configs/config.yaml

@@ -64,6 +64,15 @@ cache:
     unread_count_ttl: 30
     group_members_ttl: 120
 
+# 热门榜：定时在「候选池」上重算，只写入 Redis ZSET（TopN）+ top_ids（供本地缓存）；不写数据库
+hot_rank:
+  enabled: true
+  refresh_interval_seconds: 300
+  top_n: 100
+  recent_window_hours: 168   # 7 天内新帖进入候选
+  recent_fetch_limit: 500
+  candidate_cap: 800         # 上届 Top + 新帖 ID 合并后上限
+
 # S3对象存储配置
 # 环境变量: APP_S3_ENDPOINT, APP_S3_ACCESS_KEY, APP_S3_SECRET_KEY, APP_S3_BUCKET, APP_S3_DOMAIN
 s3:
@@ -153,18 +162,6 @@ audit:
   baidu_api_key: ""
   baidu_secret_key: ""
 
-# Gorse推荐系统配置
-# 环境变量: APP_GORSE_ADDRESS, APP_GORSE_API_KEY, APP_GORSE_DASHBOARD, APP_GORSE_IMPORT_PASSWORD
-gorse:
-  enabled: true
-  address: "http://111.170.19.33:8088"   # Gorse server地址
-  api_key: ""                            # API密钥
-  dashboard: ""                          # Gorse dashboard地址
-  import_password: "lanyimin123"         # 导入数据密码
-  embedding_api_key: "sk-ZPN5NMPSqEaOGCPfD2LqndZ5Wwmw3DC4CQgzgKhM35fI3RpD"
-  embedding_url: "https://api.littlelan.cn/v1/embeddings"
-  embedding_model: "BAAI/bge-m3"
-
 # OpenAI兼容接口配置（用于帖子审核，支持图文）
 # 环境变量：
 #   APP_OPENAI_ENABLED, APP_OPENAI_BASE_URL, APP_OPENAI_API_KEY