feat(push): include group information in chat message push notifications

Update the chat message push mechanism to include group ID and group avatar
when sending messages in group conversations. This ensures that push
notifications for group chats display the group's identity and icon
rather than the sender's personal avatar.

- Update `PushChatMessage` interface and implementation to accept `groupID` and `groupAvatar`.
- Modify `chat_service.go` to extract group metadata and pass it to the push service.
- Update `push_service.go` to include group details in the push payload extras and set the notification icon to the group avatar for group conversations.

internal/service/chat_service.go

@@ -452,8 +452,12 @@ func (s *chatServiceImpl) SendMessage(ctx context.Context, senderID string, conv
 		}
 		convType := conv.Type
 		convName := ""
+		groupID := ""
+		groupAvatar := ""
 		if conv.Type == model.ConversationTypeGroup && conv.Group != nil {
 			convName = conv.Group.Name
+			groupID = conv.Group.ID
+			groupAvatar = conv.Group.Avatar
 		}
 		allTargetIDs := make([]string, 0, len(participants))
 		for _, p := range participants {
@@ -469,9 +473,9 @@ func (s *chatServiceImpl) SendMessage(ctx context.Context, senderID string, conv
 			offlineTargetIDs = allTargetIDs
 		}
 		if len(offlineTargetIDs) > 0 {
-			go func(ids []string, sender ChatMessageSender) {
+			go func(ids []string, sender ChatMessageSender, gid string, gavatar string) {
 				for _, uid := range ids {
-					if pushErr := s.pushSvc.PushChatMessage(context.Background(), uid, conversationID, &sender, convType, convName, message); pushErr != nil {
+					if pushErr := s.pushSvc.PushChatMessage(context.Background(), uid, conversationID, &sender, convType, convName, message, gid, gavatar); pushErr != nil {
 						zap.L().Debug("push chat message failed",
 							zap.String("userID", uid),
 							zap.String("conversationID", conversationID),
@@ -479,7 +483,7 @@ func (s *chatServiceImpl) SendMessage(ctx context.Context, senderID string, conv
 						)
 					}
 				}
-			}(offlineTargetIDs, sender)
+			}(offlineTargetIDs, sender, groupID, groupAvatar)
 		}
 	}