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/cache/keys.go

@@ -86,25 +86,13 @@ func ConversationListKey(userID string, page, pageSize int) string {
 	return fmt.Sprintf("%s:%s:%d:%d", PrefixConversationList, userID, page, pageSize)
 }
 
-// ConversationDetailKey 生成会话详情缓存键
-func ConversationDetailKey(conversationID, userID string) string {
-	return fmt.Sprintf("%s:%s:%s", PrefixConversationDetail, conversationID, userID)
-}
 
 // GroupMembersKey 生成群组成员缓存键
 func GroupMembersKey(groupID string, page, pageSize int) string {
 	return fmt.Sprintf("%s:%s:page:%d:size:%d", PrefixGroupMembers, groupID, page, pageSize)
 }
 
-// GroupMembersAllKey 生成群组全量成员ID列表缓存键
-func GroupMembersAllKey(groupID string) string {
-	return fmt.Sprintf("%s:all:%s", PrefixGroupMembers, groupID)
-}
 
-// GroupInfoKey 生成群组信息缓存键
-func GroupInfoKey(groupID string) string {
-	return fmt.Sprintf("%s:%s", PrefixGroupInfo, groupID)
-}
 
 // UnreadSystemKey 生成系统消息未读数缓存键
 func UnreadSystemKey(userID string) string {
@@ -121,15 +109,6 @@ func UnreadDetailKey(userID, conversationID string) string {
 	return fmt.Sprintf("%s:%s:%s", PrefixUnreadDetail, userID, conversationID)
 }
 
-// UserInfoKey 生成用户信息缓存键
-func UserInfoKey(userID string) string {
-	return fmt.Sprintf("%s:%s", PrefixUserInfo, userID)
-}
-
-// UserMeKey 生成当前用户信息缓存键
-func UserMeKey(userID string) string {
-	return fmt.Sprintf("%s:%s", PrefixUserMe, userID)
-}
 
 // ChannelsAllListKey 频道全量列表缓存键（含未启用，供 MapByIDs 解析历史帖子 channel）
 func ChannelsAllListKey() string {
@@ -156,20 +135,12 @@ func InvalidateConversationList(cache Cache, userID string) {
 	cache.DeleteByPrefix(PrefixConversationList + ":" + userID + ":")
 }
 
-// InvalidateConversationDetail 失效会话详情缓存
-func InvalidateConversationDetail(cache Cache, conversationID, userID string) {
-	cache.Delete(ConversationDetailKey(conversationID, userID))
-}
 
 // InvalidateGroupMembers 失效群组成员缓存
 func InvalidateGroupMembers(cache Cache, groupID string) {
 	cache.DeleteByPrefix(PrefixGroupMembers + ":" + groupID)
 }
 
-// InvalidateGroupInfo 失效群组信息缓存
-func InvalidateGroupInfo(cache Cache, groupID string) {
-	cache.Delete(GroupInfoKey(groupID))
-}
 
 // InvalidateUnreadSystem 失效系统消息未读数缓存
 func InvalidateUnreadSystem(cache Cache, userID string) {
@@ -186,11 +157,6 @@ func InvalidateUnreadDetail(cache Cache, userID, conversationID string) {
 	cache.Delete(UnreadDetailKey(userID, conversationID))
 }
 
-// InvalidateUserInfo 失效用户信息缓存
-func InvalidateUserInfo(cache Cache, userID string) {
-	cache.Delete(UserInfoKey(userID))
-	cache.Delete(UserMeKey(userID))
-}
 
 // ============================================================
 // 消息缓存 Key 生成函数
@@ -231,17 +197,9 @@ func MessageIdempotentKey(senderID, clientMsgID string) string {
 	return fmt.Sprintf("%s:%s:%s", keyPrefixMsgIdempotent, senderID, clientMsgID)
 }
 
-// PushDedupKey 推送去重键，防止同一消息重复推送给同一用户
-func PushDedupKey(userID, messageID string) string {
-	return fmt.Sprintf("push_dedup:%s:%s", userID, messageID)
-}
 
 // UserReadSeqKey 用户已读位置缓存键（OpenIM 风格 SEQ_USER_READ:{convID}:{userID}）
 func UserReadSeqKey(convID, userID string) string {
 	return fmt.Sprintf("%s:%s:%s", PrefixUserReadSeq, convID, userID)
 }
 
-// ConvMaxSeqKey 会话最大 seq 缓存键
-func ConvMaxSeqKey(convID string) string {
-	return fmt.Sprintf("%s:%s", keyPrefixMsgSeq, convID)
-}

internal/cache/layered_cache.go

@@ -2,13 +2,11 @@
 
 import (
 	"context"
-	"encoding/json"
 	"strconv"
 	"sync"
 	"time"
 
 	redislib "github.com/redis/go-redis/v9"
-	"go.uber.org/zap"
 
 	redisPkg "with_you/internal/pkg/redis"
 )
@@ -412,59 +410,6 @@ func (c *LayeredCache) GetRedisClient() *redisPkg.Client {
 	return c.redis.GetRedisClient()
 }
 
-func GetTypedLayered[T any](c *LayeredCache, key string) (T, bool) {
-	var zero T
-	if !c.enabled {
-		return zero, false
-	}
-
-	raw, ok := c.Get(key)
-	if !ok {
-		return zero, false
-	}
-
-	if typed, ok := raw.(T); ok {
-		return typed, true
-	}
-
-	if str, ok := raw.(string); ok {
-		var out T
-		if err := json.Unmarshal([]byte(str), &out); err != nil {
-			return zero, false
-		}
-		return out, true
-	}
-
-	if data, err := json.Marshal(raw); err == nil {
-		var out T
-		if err := json.Unmarshal(data, &out); err != nil {
-			return zero, false
-		}
-		return out, true
-	}
-
-	return zero, false
-}
-
-func GetOrLoadLayered[T any](
-	c *LayeredCache,
-	key string,
-	ttl time.Duration,
-	loader func() (T, error),
-) (T, error) {
-	if cached, ok := GetTypedLayered[T](c, key); ok {
-		return cached, nil
-	}
-
-	loaded, err := loader()
-	if err != nil {
-		var zero T
-		return zero, err
-	}
-
-	c.Set(key, loaded, ttl)
-	return loaded, nil
-}
 
 func (c *LayeredCache) InvalidateUserCache(userID uint) {
 	c.DeleteByPrefix(cacheKeyPrefixUser + ":")
@@ -509,15 +454,3 @@ func buildGroupMembersKey(groupID uint) string {
 }
 
 var _ Cache = (*LayeredCache)(nil)
-
-func (c *LayeredCache) logStats() {
-	stats := c.GetStats()
-	zap.L().Debug("LayeredCache stats",
-		zap.Int64("local_hits", stats.LocalHits),
-		zap.Int64("redis_hits", stats.RedisHits),
-		zap.Int64("misses", stats.Misses),
-		zap.Int64("sets", stats.Sets),
-		zap.Int64("invalidates", stats.Invalidates),
-		zap.Float64("hit_rate", c.GetHitRate()),
-	)
-}

internal/cache/metrics.go

@@ -14,25 +14,6 @@ type cacheMetrics struct {
 // metrics 全局缓存指标实例
 var metrics cacheMetrics
 
-// MetricsSnapshot 指标快照
-type MetricsSnapshot struct {
-	Hit         int64
-	Miss        int64
-	DecodeError int64
-	SetError    int64
-	Invalidate  int64
-}
-
-// GetMetricsSnapshot 获取当前指标快照
-func GetMetricsSnapshot() MetricsSnapshot {
-	return MetricsSnapshot{
-		Hit:         metrics.hit.Load(),
-		Miss:        metrics.miss.Load(),
-		DecodeError: metrics.decodeError.Load(),
-		SetError:    metrics.setError.Load(),
-		Invalidate:  metrics.invalidate.Load(),
-	}
-}
 
 // recordHit 记录缓存命中
 func recordHit() {