feat(schedule): add course table screens and navigation

Add complete schedule functionality including:
- Schedule screen with weekly course table view
- Course detail screen with transparent modal presentation
- New ScheduleStack navigator integrated into main tab bar
- Schedule service for API interactions
- Type definitions for course entities

Also includes bug fixes for group invite/request handlers
to include required groupId parameter.

internal/service/group_service.go

@@ -145,6 +145,45 @@ func (s *groupService) publishGroupNotice(groupID string, notice groupNoticeMess
 	}
 }
 
+// invalidateConversationCachesAfterSystemMessage 系统消息写入后失效相关缓存
+func (s *groupService) invalidateConversationCachesAfterSystemMessage(conversationID string) {
+	if conversationID == "" || s.messageRepo == nil {
+		return
+	}
+	// 新系统消息会影响消息分页列表
+	cache.InvalidateMessagePages(s.cache, conversationID)
+	// 参与者列表可能发生变化（加群/退群）后，这里统一清理一次
+	s.cache.Delete(cache.ParticipantListKey(conversationID))
+
+	participants, err := s.messageRepo.GetConversationParticipants(conversationID)
+	if err != nil {
+		return
+	}
+	for _, p := range participants {
+		if p == nil || p.UserID == "" {
+			continue
+		}
+		// 会话最后消息、未读数会变化，清理用户维度缓存
+		cache.InvalidateConversationList(s.cache, p.UserID)
+		cache.InvalidateUnreadConversation(s.cache, p.UserID)
+		cache.InvalidateUnreadDetail(s.cache, p.UserID, conversationID)
+	}
+}
+
+// invalidateConversationCachesAfterMembershipChange 成员变更后失效相关缓存
+func (s *groupService) invalidateConversationCachesAfterMembershipChange(conversationID, userID string) {
+	if conversationID == "" {
+		return
+	}
+	s.cache.Delete(cache.ParticipantListKey(conversationID))
+	if userID != "" {
+		s.cache.Delete(cache.ParticipantKey(conversationID, userID))
+		cache.InvalidateConversationList(s.cache, userID)
+		cache.InvalidateUnreadConversation(s.cache, userID)
+		cache.InvalidateUnreadDetail(s.cache, userID, conversationID)
+	}
+}
+
 // ==================== 群组管理 ====================
 
 // CreateGroup 创建群组
@@ -444,6 +483,7 @@ func (s *groupService) broadcastMemberJoinNotice(groupID string, targetUserID st
 				log.Printf("[broadcastMemberJoinNotice] 保存入群提示消息失败: groupID=%s, userID=%s, err=%v", groupID, targetUserID, err)
 			} else {
 				savedMessage = msg
+				s.invalidateConversationCachesAfterSystemMessage(conv.ID)
 			}
 		} else {
 			log.Printf("[broadcastMemberJoinNotice] 获取群组会话失败: groupID=%s, err=%v", groupID, err)
@@ -502,6 +542,7 @@ func (s *groupService) addMemberToGroupAndConversation(group *model.Group, userI
 			if err := s.messageRepo.AddParticipant(conv.ID, userID); err != nil {
 				log.Printf("[addMemberToGroupAndConversation] 添加会话参与者失败: groupID=%s, userID=%s, err=%v", group.ID, userID, err)
 			}
+			s.invalidateConversationCachesAfterMembershipChange(conv.ID, userID)
 		}
 	}
 	cache.InvalidateGroupMembers(s.cache, group.ID)
@@ -1036,6 +1077,7 @@ func (s *groupService) LeaveGroup(userID string, groupID string) error {
 			// 如果移除参与者失败，记录日志但不阻塞退出群流程
 			fmt.Printf("[WARN] LeaveGroup: failed to remove participant %s from conversation %s, error: %v\n", userID, conv.ID, err)
 		}
+		s.invalidateConversationCachesAfterMembershipChange(conv.ID, userID)
 	}
 
 	// 失效群组成员缓存
@@ -1092,6 +1134,7 @@ func (s *groupService) RemoveMember(userID string, groupID string, targetUserID
 			if err := s.messageRepo.RemoveParticipant(conv.ID, targetUserID); err != nil {
 				log.Printf("[RemoveMember] 移除会话参与者失败: groupID=%s, userID=%s, err=%v", groupID, targetUserID, err)
 			}
+			s.invalidateConversationCachesAfterMembershipChange(conv.ID, targetUserID)
 		}
 	}
 
@@ -1290,6 +1333,7 @@ func (s *groupService) MuteMember(userID string, groupID string, targetUserID st
 			} else {
 				savedMessage = msg
 				log.Printf("[MuteMember] 禁言消息已保存, ID=%s, Seq=%d", msg.ID, msg.Seq)
+				s.invalidateConversationCachesAfterSystemMessage(conv.ID)
 			}
 		} else {
 			log.Printf("[MuteMember] 获取群组会话失败: %v", err)