refactor(server): decouple services and improve architecture

- Introduce interfaces for all major services (JWT, PostAI, Comment, Message, Notification, QRCodeLogin, Upload, Vote, etc.) to support dependency inversion.
- Move query parameters from `internal/dto` to a new `internal/query` package to separate request payloads from data transfer objects.
- Refactor `internal/router` to use embedded `RouterDeps` for cleaner dependency management.
- Decouple handlers from repositories by injecting services instead of direct repository access, ensuring proper layering.
- Improve database initialization by moving it from `internal/model` to `internal/database`.
- Optimize message decryption by implementing a more efficient `BatchDecrypt` method in `MessageEncryptor` using a worker pool.
- Enhance error handling and security by implementing fail-fast checks for encryption key length during startup.
- Clean up unused code, including the `avatar` package and several unused DTOs.

internal/service/chat_service.go

@@ -42,7 +42,7 @@ type ChatService interface {
 
 	// 已读管理
 	MarkAsRead(ctx context.Context, conversationID string, userID string, seq int64) error
-		MarkAsReadBatch(ctx context.Context, userID string, items []dto.BatchMarkReadItem) (int, error)
+	MarkAsReadBatch(ctx context.Context, userID string, items []dto.BatchMarkReadItem) (int, error)
 	GetUnreadCount(ctx context.Context, conversationID string, userID string) (int64, error)
 	GetAllUnreadCount(ctx context.Context, userID string) (int64, error)
 
@@ -69,21 +69,21 @@ type ChatService interface {
 	GetUnreadCountBatch(ctx context.Context, userID string, convIDs []string) (map[string]int64, error)
 	GetLastMessagesBatch(ctx context.Context, convIDs []string) (map[string]*model.Message, error)
 
-		// 已读位置（OpenIM 风格缓存）
-		GetUserReadSeq(ctx context.Context, conversationID string, userID string) (int64, error)
+	// 已读位置（OpenIM 风格缓存）
+	GetUserReadSeq(ctx context.Context, conversationID string, userID string) (int64, error)
 }
 
 // chatServiceImpl 聊天服务实现
 type chatServiceImpl struct {
-	repo        repository.MessageRepository
-	userRepo    repository.UserRepository
-	sensitive   SensitiveService
-	wsHub       ws.MessagePublisher
-	pushSvc     PushService
-	cache       cache.Cache
+	repo      repository.MessageRepository
+	userRepo  repository.UserRepository
+	sensitive SensitiveService
+	wsHub     ws.MessagePublisher
+	pushSvc   PushService
+	cache     cache.Cache
 
 	conversationCache *cache.ConversationCache
-	uploadService     *UploadService
+	uploadService     UploadService
 	versionLogRepo    repository.ConversationVersionLogRepository
 	versionLogEnabled bool
 	versionLogMaxGap  int64
@@ -98,7 +98,7 @@ func NewChatService(
 	sensitive SensitiveService,
 	publisher ws.MessagePublisher,
 	cacheBackend cache.Cache,
-	uploadService *UploadService,
+	uploadService UploadService,
 	pushSvc PushService,
 	seqBufferMgr *cache.SeqBufferManager,
 	pushWorker *PushWorker,
@@ -479,7 +479,7 @@ func (s *chatServiceImpl) SendMessage(ctx context.Context, senderID string, conv
 		Status:         model.MessageStatusNormal,
 	}
 
-		// seq 由 CreateMessageWithSeq 在事务内原子分配
+	// seq 由 CreateMessageWithSeq 在事务内原子分配
 
 	// 使用事务创建消息并更新seq
 	if err := s.repo.CreateMessageWithSeq(message); err != nil {
@@ -1071,7 +1071,7 @@ func (s *chatServiceImpl) SaveMessage(ctx context.Context, senderID string, conv
 		Status:         model.MessageStatusNormal,
 	}
 
-		// seq 由 CreateMessageWithSeq 在事务内原子分配
+	// seq 由 CreateMessageWithSeq 在事务内原子分配
 
 	if err := s.repo.CreateMessageWithSeq(message); err != nil {
 		return nil, fmt.Errorf("failed to save message: %w", err)