refactor: cleanup unused code and simplify internal packages

This commit performs a significant cleanup of the codebase by removing unused functions, methods, and entire files across various internal modules. This reduces technical debt and simplifies the project structure.

Key changes include:
- **cache**: Removed unused cache key generators and metrics snapshots.
- **dto**: Removed redundant converter functions and segment creation helpers.
- **middleware**: Deleted the unused `logger.go` middleware and simplified `ratelimit.go` and `casbin.go`.
- **model**: Removed unused ID helpers, database closing functions, and batch decryption logic.
- **pkg**: Cleaned up unused utility functions in `circuitbreaker`, `crypto`, `cursor`, `hook`, and `utils`.
- **service**: Deleted `account_cleanup_service.go` and removed unused helper functions in `log_cleanup_service.go` and `sensitive_service.go`.
- **repository**: Removed unused private loading methods in `comment_repo.go`.

internal/pkg/utils/snowflake.go

@@ -61,12 +61,6 @@ var (
 	globalSnowflakeErr  error
 )
 
-// InitSnowflake 初始化全局雪花算法实例
-// nodeID: 机器ID，范围0-1023，可以通过环境变量 NODE_ID 配置
-func InitSnowflake(nodeID int64) error {
-	globalSnowflake, globalSnowflakeErr = NewSnowflake(nodeID)
-	return globalSnowflakeErr
-}
 
 // GetSnowflake 获取全局雪花算法实例
 // 如果未初始化，会自动使用默认配置初始化
@@ -191,71 +185,12 @@ func (s *Snowflake) waitNextMillis(timestamp int64) int64 {
 	return now
 }
 
-// ParseID 解析雪花算法ID，提取其中的信息
-// id: 要解析的雪花算法ID
-// 返回值：包含时间戳、机器ID、序列号的结构体
-func ParseID(id int64) *IDInfo {
-	// 提取序列号（低12位）
-	sequence := id & maxSequence
-
-	// 提取机器ID（中间10位）
-	nodeID := (id >> nodeIDShift) & maxNodeID
-
-	// 提取时间戳（高41位）
-	timestamp := (id >> timestampShift) + customEpoch
-
-	return &IDInfo{
-		Timestamp: timestamp,
-		NodeID:    nodeID,
-		Sequence:  sequence,
-	}
-}
 
 // currentTimestamp 获取当前时间戳（毫秒）
 func currentTimestamp() int64 {
 	return time.Now().UnixNano() / 1e6
 }
 
-// GetNodeID 获取当前机器ID
-func (s *Snowflake) GetNodeID() int64 {
-	return s.nodeID
-}
 
-// GetCustomEpoch 获取自定义纪元时间
-func GetCustomEpoch() int64 {
-	return customEpoch
-}
 
-// IDToTime 将雪花算法ID转换为生成时间
-// 这是一个便捷方法，等价于 ParseID(id).Timestamp
-func IDToTime(id int64) time.Time {
-	info := ParseID(id)
-	return time.Unix(0, info.Timestamp*1e6) // 毫秒转纳秒
-}
 
-// ValidateID 验证ID是否为有效的雪花算法ID
-// 检查时间戳是否在合理范围内
-func ValidateID(id int64) bool {
-	if id <= 0 {
-		return false
-	}
-
-	info := ParseID(id)
-
-	// 检查时间戳是否在合理范围内
-	// 不能早于纪元时间，不能晚于当前时间太多（允许1分钟的时钟偏差）
-	now := currentTimestamp()
-	if info.Timestamp < customEpoch || info.Timestamp > now+60000 {
-		return false
-	}
-
-	// 检查机器ID和序列号是否在有效范围内
-	if info.NodeID < 0 || info.NodeID > maxNodeID {
-		return false
-	}
-	if info.Sequence < 0 || info.Sequence > maxSequence {
-		return false
-	}
-
-	return true
-}