refactor: upgrade to Go 1.26 and modernize code idioms

- Replace `interface{}` with `any` type alias across all packages
- Use built-in `min()`/`max()` for parameter clamping
- Use `slices.SortFunc`, `slices.Min`, `slices.Max` for cleaner code
- Use `strings.Cut()` for simpler string parsing in auth middleware
- Use `errors.Is()` for proper error comparison in handlers
- Update dependencies: golang.org/x/image 0.37.0 -> 0.38.0
- Add Wire code generation guidelines to ARCHITECTURE.md
- Disable Go cache in CI build workflow

internal/service/group_service.go

@@ -56,7 +56,7 @@ type GroupService interface {
 	// 群组管理
 	CreateGroup(ownerID string, name string, description string, memberIDs []string) (*model.Group, error)
 	GetGroupByID(id string) (*model.Group, error)
-	UpdateGroup(userID string, groupID string, updates map[string]interface{}) error
+	UpdateGroup(userID string, groupID string, updates map[string]any) error
 	DissolveGroup(userID string, groupID string) error
 	TransferOwner(userID string, groupID string, newOwnerID string) error
 	GetUserGroups(userID string, page, pageSize int) ([]model.Group, int64, error)
@@ -300,7 +300,7 @@ func (s *groupService) GetMemberCount(groupID string) (int, error) {
 }
 
 // UpdateGroup 更新群组信息
-func (s *groupService) UpdateGroup(userID string, groupID string, updates map[string]interface{}) error {
+func (s *groupService) UpdateGroup(userID string, groupID string, updates map[string]any) error {
 	// 检查群组是否存在
 	group, err := s.groupRepo.GetByID(groupID)
 	if err != nil {
@@ -448,7 +448,7 @@ func (s *groupService) broadcastMemberJoinNotice(groupID string, targetUserID st
 				ConversationID: conv.ID,
 				SenderID:       model.SystemSenderIDStr,
 				Segments: model.MessageSegments{
-					{Type: "text", Data: map[string]interface{}{"text": noticeContent}},
+					{Type: "text", Data: map[string]any{"text": noticeContent}},
 				},
 				Status:   model.MessageStatusNormal,
 				Category: model.CategoryNotification,
@@ -1360,7 +1360,7 @@ func (s *groupService) MuteMember(userID string, groupID string, targetUserID st
 				ConversationID: conv.ID,
 				SenderID:       model.SystemSenderIDStr,
 				Segments: model.MessageSegments{
-					{Type: "text", Data: map[string]interface{}{"text": noticeContent}},
+					{Type: "text", Data: map[string]any{"text": noticeContent}},
 				},
 				Status:   model.MessageStatusNormal,
 				Category: model.CategoryNotification,