feat: 新增群组成员数量统计功能并在接口中返回

实现了群组成员数量统计的接口，包含数据库层统计逻辑，在群组详情、设置等接口中返回实时成员数，同时修复了测试用例中参数空格问题。

server/store/local_message_crypto_integration_test.go

@@ -37,7 +37,7 @@ func (p localCryptoProvider) RegistrationSMSEnabled() (bool, error) {
 func (p localCryptoProvider) ThirdPartyConfig(string, ...string) (map[string]string, error) {
 	return nil, types.ErrUnsupported
 }
-func (p localCryptoProvider) LatestAppRelease(string, string) (*types.AppRelease, error) {
+func (p localCryptoProvider) LatestAppRelease(string, string, string) (*types.AppRelease, error) {
 	return nil, types.ErrUnsupported
 }
 func (p localCryptoProvider) ModerationProvider() (*types.ModerationProviderConfig, error) {

server/store/store.go

@@ -1892,6 +1892,7 @@ type GroupBusinessPersistenceInterface interface {
 	UpsertMember(types.TenantID, *types.GroupMember) (*types.GroupMember, error)
 	GetMember(types.TenantID, string, types.Uid) (*types.GroupMember, error)
 	ListMembers(types.TenantID, string, types.GroupMemberListOptions) ([]types.GroupMember, string, error)
+	MembersCount(types.TenantID, []string) (map[string]int64, error)
 	UpdateMember(types.TenantID, string, types.Uid, types.GroupMemberPatch) (*types.GroupMember, error)
 	CreateInvitation(types.TenantID, *types.GroupInvitation) (*types.GroupInvitation, error)
 	AcceptInvitation(types.TenantID, string, types.Uid, any, time.Time) (*types.GroupInvitation, error)
@@ -2064,6 +2065,27 @@ func (groupBusinessMapper) GetMember(tenantID types.TenantID, topic string, uid
 	return member, err
 }
 
+func (groupBusinessMapper) MembersCount(tenantID types.TenantID, topics []string) (map[string]int64, error) {
+	cleaned := make([]string, 0, len(topics))
+	seen := make(map[string]bool, len(topics))
+	for _, topic := range topics {
+		topic = strings.TrimSpace(topic)
+		if topic == "" || seen[topic] {
+			continue
+		}
+		seen[topic] = true
+		cleaned = append(cleaned, topic)
+	}
+	if len(cleaned) == 0 {
+		return map[string]int64{}, nil
+	}
+	tenantAdp, err := tenantBusinessAdapter(tenantID)
+	if err != nil {
+		return nil, err
+	}
+	return tenantAdp.TenantGroupMembersCount(tenantID, cleaned)
+}
+
 func (groupBusinessMapper) ListMembers(tenantID types.TenantID, topic string, opts types.GroupMemberListOptions) ([]types.GroupMember, string, error) {
 	if strings.TrimSpace(topic) == "" {
 		return nil, "", types.ErrMalformed