feat(upload): integrate upload service for chat image validation and S3 uploads

- Added UploadService to handle image uploads and validation for chat messages.
- Updated ChatService and MessageService to utilize UploadService for validating image segments in messages.
- Enhanced wire generation to inject UploadService into relevant services.
- Introduced UploadImageBytes method in UploadService for uploading images directly from memory.
- Added TrustedPublicURLPrefix method in S3 Client for generating public URLs for uploaded images.

internal/service/chat_service.go

@@ -64,6 +64,7 @@ type chatServiceImpl struct {
 
 	// 缓存相关字段
 	conversationCache *cache.ConversationCache
+	uploadService     *UploadService // 校验聊天图片 URL 来源
 }
 
 // NewChatService 创建聊天服务
@@ -74,6 +75,7 @@ func NewChatService(
 	sensitive SensitiveService,
 	sseHub *sse.Hub,
 	cacheBackend cache.Cache,
+	uploadService *UploadService,
 ) ChatService {
 	// 创建适配器
 	convRepoAdapter := cache.NewConversationRepositoryAdapter(repo)
@@ -94,6 +96,7 @@ func NewChatService(
 		sensitive:         sensitive,
 		sseHub:            sseHub,
 		conversationCache: conversationCache,
+		uploadService:     uploadService,
 	}
 }
 
@@ -269,7 +272,7 @@ func (s *chatServiceImpl) SendMessage(ctx context.Context, senderID string, conv
 	}
 
 	// 验证用户是否是会话参与者
-	participant, err := s.getParticipant(ctx, conversationID, senderID)
+	_, err = s.getParticipant(ctx, conversationID, senderID)
 	if err != nil {
 		if errors.Is(err, gorm.ErrRecordNotFound) {
 			return nil, errors.New("您不是该会话的参与者")
@@ -277,6 +280,12 @@ func (s *chatServiceImpl) SendMessage(ctx context.Context, senderID string, conv
 		return nil, fmt.Errorf("failed to get participant: %w", err)
 	}
 
+	if s.uploadService != nil {
+		if err := s.uploadService.ValidateChatMessageImageSegments(segments); err != nil {
+			return nil, err
+		}
+	}
+
 	// 创建消息
 	message := &model.Message{
 		ConversationID: conversationID,
@@ -351,8 +360,6 @@ func (s *chatServiceImpl) SendMessage(ctx context.Context, senderID string, conv
 		}
 	}
 
-	_ = participant // 避免未使用变量警告
-
 	return message, nil
 }
 
@@ -701,6 +708,12 @@ func (s *chatServiceImpl) SaveMessage(ctx context.Context, senderID string, conv
 		return nil, fmt.Errorf("failed to get participant: %w", err)
 	}
 
+	if s.uploadService != nil {
+		if err := s.uploadService.ValidateChatMessageImageSegments(segments); err != nil {
+			return nil, err
+		}
+	}
+
 	message := &model.Message{
 		ConversationID: conversationID,
 		SenderID:       senderID,