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/cache/layered_cache.go

@@ -7,6 +7,7 @@ import (
 	"sync"
 	"time"
 
+	redislib "github.com/redis/go-redis/v9"
 	"go.uber.org/zap"
 
 	redisPkg "carrot_bbs/internal/pkg/redis"
@@ -294,6 +295,21 @@ func (c *LayeredCache) ZRevRangeByScore(ctx context.Context, key string, max, mi
 	return c.redis.ZRevRangeByScore(ctx, key, max, min, offset, count)
 }
 
+func (c *LayeredCache) ZRevRange(ctx context.Context, key string, start, stop int64) ([]string, error) {
+	if !c.enabled || c.redis == nil {
+		return nil, ErrKeyNotFound
+	}
+	return c.redis.ZRevRange(ctx, key, start, stop)
+}
+
+func (c *LayeredCache) ZReplaceSortedSet(ctx context.Context, key string, members []redislib.Z) error {
+	if !c.enabled || c.redis == nil {
+		return ErrKeyNotFound
+	}
+	c.local.Delete(key)
+	return c.redis.ZReplaceSortedSet(ctx, key, members)
+}
+
 func (c *LayeredCache) ZRem(ctx context.Context, key string, members ...any) error {
 	if !c.enabled || c.redis == nil {
 		return nil