feat(websocket): integrate WebSocket support and refactor SSE handling

- Added WebSocket support by introducing a new WSHandler and related infrastructure.
- Replaced SSE implementations with WebSocket equivalents across message and QR code handlers.
- Updated service and repository layers to utilize WebSocket for real-time messaging.
- Removed obsolete SSE hub and related code, streamlining the application for WebSocket usage.
- Enhanced router to include WebSocket endpoints for real-time communication.

internal/service/group_service.go

@@ -14,8 +14,8 @@ import (
 	apperrors "carrot_bbs/internal/errors"
 	"carrot_bbs/internal/model"
 	"carrot_bbs/internal/pkg/cursor"
-	"carrot_bbs/internal/pkg/sse"
 	"carrot_bbs/internal/pkg/utils"
+	"carrot_bbs/internal/pkg/ws"
 	"carrot_bbs/internal/repository"
 
 	"go.uber.org/zap"
@@ -111,19 +111,19 @@ type groupService struct {
 	messageRepo repository.MessageRepository
 	requestRepo repository.GroupJoinRequestRepository
 	notifyRepo  repository.SystemNotificationRepository
-	sseHub      *sse.Hub
+	wsHub       *ws.Hub
 	cache       cache.Cache
 }
 
 // NewGroupService 创建群组服务
-func NewGroupService(groupRepo repository.GroupRepository, userRepo repository.UserRepository, messageRepo repository.MessageRepository, requestRepo repository.GroupJoinRequestRepository, notifyRepo repository.SystemNotificationRepository, sseHub *sse.Hub, cacheBackend cache.Cache) GroupService {
+func NewGroupService(groupRepo repository.GroupRepository, userRepo repository.UserRepository, messageRepo repository.MessageRepository, requestRepo repository.GroupJoinRequestRepository, notifyRepo repository.SystemNotificationRepository, wsHub *ws.Hub, cacheBackend cache.Cache) GroupService {
 	return &groupService{
 		groupRepo:   groupRepo,
 		userRepo:    userRepo,
 		messageRepo: messageRepo,
 		requestRepo: requestRepo,
 		notifyRepo:  notifyRepo,
-		sseHub:      sseHub,
+		wsHub:       wsHub,
 		cache:       cacheBackend,
 	}
 }
@@ -152,9 +152,9 @@ func (s *groupService) publishGroupNotice(groupID string, notice groupNoticeMess
 		)
 		return
 	}
-	if s.sseHub != nil {
+	if s.wsHub != nil {
 		for _, m := range members {
-			s.sseHub.PublishToUser(m.UserID, "group_notice", notice)
+			s.wsHub.PublishToUser(m.UserID, "group_notice", notice)
 		}
 	}
 }