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.

internal/dto/dto.go

@@ -940,7 +940,6 @@ type AdminPostDetailResponse struct {
 	FavoritesCount int                 `json:"favorites_count,omitzero"`
 	SharesCount    int                 `json:"shares_count,omitzero"`
 	ViewsCount     int                 `json:"views_count,omitzero"`
-	HotScore       float64             `json:"hot_score"`
 	IsPinned       bool                `json:"is_pinned"`
 	IsFeatured     bool                `json:"is_featured"`
 	IsLocked       bool                `json:"is_locked"`