fix: Antigravity 刷新 token 时检测 project_id 缺失

- 刷新 token 后调用 LoadCodeAssist 获取 project_id
- 如果获取失败，保留原有 project_id，标记账户为 error
- token 仍会正常更新，不影响凭证刷新
- 错误信息：账户缺少project id，可能无法使用Antigravity

backend/internal/handler/admin/account_handler.go

@@ -450,6 +450,28 @@ func (h *AccountHandler) Refresh(c *gin.Context) {
 				newCredentials[k] = v
 			}
 		}
+
+		// 如果 project_id 获取失败，先更新凭证，再标记账户为 error
+		if tokenInfo.ProjectIDMissing {
+			// 先更新凭证
+			_, updateErr := h.adminService.UpdateAccount(c.Request.Context(), accountID, &service.UpdateAccountInput{
+				Credentials: newCredentials,
+			})
+			if updateErr != nil {
+				response.InternalError(c, "Failed to update credentials: "+updateErr.Error())
+				return
+			}
+			// 标记账户为 error
+			if setErr := h.adminService.SetAccountError(c.Request.Context(), accountID, "账户缺少project id，可能无法使用Antigravity"); setErr != nil {
+				response.InternalError(c, "Failed to set account error: "+setErr.Error())
+				return
+			}
+			response.Success(c, gin.H{
+				"message": "Token refreshed but project_id is missing, account marked as error",
+				"warning": "missing_project_id",
+			})
+			return
+		}
 	} else {
 		// Use Anthropic/Claude OAuth service to refresh token
 		tokenInfo, err := h.oauthService.RefreshAccountToken(c.Request.Context(), account)

backend/internal/service/admin_service.go

@@ -42,6 +42,7 @@ type AdminService interface {
 	DeleteAccount(ctx context.Context, id int64) error
 	RefreshAccountCredentials(ctx context.Context, id int64) (*Account, error)
 	ClearAccountError(ctx context.Context, id int64) (*Account, error)
+	SetAccountError(ctx context.Context, id int64, errorMsg string) error
 	SetAccountSchedulable(ctx context.Context, id int64, schedulable bool) (*Account, error)
 	BulkUpdateAccounts(ctx context.Context, input *BulkUpdateAccountsInput) (*BulkUpdateAccountsResult, error)
 
@@ -991,6 +992,10 @@ func (s *adminServiceImpl) ClearAccountError(ctx context.Context, id int64) (*Ac
 	return account, nil
 }
 
+func (s *adminServiceImpl) SetAccountError(ctx context.Context, id int64, errorMsg string) error {
+	return s.accountRepo.SetError(ctx, id, errorMsg)
+}
+
 func (s *adminServiceImpl) SetAccountSchedulable(ctx context.Context, id int64, schedulable bool) (*Account, error) {
 	if err := s.accountRepo.SetSchedulable(ctx, id, schedulable); err != nil {
 		return nil, err

backend/internal/service/antigravity_oauth_service.go

@@ -82,13 +82,14 @@ type AntigravityExchangeCodeInput struct {
 
 // AntigravityTokenInfo token 信息
 type AntigravityTokenInfo struct {
-	AccessToken  string `json:"access_token"`
-	RefreshToken string `json:"refresh_token"`
-	ExpiresIn    int64  `json:"expires_in"`
-	ExpiresAt    int64  `json:"expires_at"`
-	TokenType    string `json:"token_type"`
-	Email        string `json:"email,omitempty"`
-	ProjectID    string `json:"project_id,omitempty"`
+	AccessToken      string `json:"access_token"`
+	RefreshToken     string `json:"refresh_token"`
+	ExpiresIn        int64  `json:"expires_in"`
+	ExpiresAt        int64  `json:"expires_at"`
+	TokenType        string `json:"token_type"`
+	Email            string `json:"email,omitempty"`
+	ProjectID        string `json:"project_id,omitempty"`
+	ProjectIDMissing bool   `json:"-"` // LoadCodeAssist 未返回 project_id
 }
 
 // ExchangeCode 用 authorization code 交换 token
@@ -236,16 +237,15 @@ func (s *AntigravityOAuthService) RefreshAccountToken(ctx context.Context, accou
 		tokenInfo.Email = existingEmail
 	}
 
-	// 每次刷新都调用 LoadCodeAssist 更新 project_id
+	// 每次刷新都调用 LoadCodeAssist 获取 project_id
 	client := antigravity.NewClient(proxyURL)
 	loadResp, _, err := client.LoadCodeAssist(ctx, tokenInfo.AccessToken)
-	if err != nil {
-		// 失败时保留原有的 project_id
+	if err != nil || loadResp == nil || loadResp.CloudAICompanionProject == "" {
+		// LoadCodeAssist 失败或返回空，保留原有 project_id，标记缺失
 		existingProjectID := strings.TrimSpace(account.GetCredential("project_id"))
-		if existingProjectID != "" {
-			tokenInfo.ProjectID = existingProjectID
-		}
-	} else if loadResp != nil && loadResp.CloudAICompanionProject != "" {
+		tokenInfo.ProjectID = existingProjectID
+		tokenInfo.ProjectIDMissing = true
+	} else {
 		tokenInfo.ProjectID = loadResp.CloudAICompanionProject
 	}
 

backend/internal/service/antigravity_token_refresher.go

@@ -61,5 +61,10 @@ func (r *AntigravityTokenRefresher) Refresh(ctx context.Context, account *Accoun
 		}
 	}
 
+	// 如果 project_id 获取失败，返回 credentials 但同时返回错误让账户被标记
+	if tokenInfo.ProjectIDMissing {
+		return newCredentials, fmt.Errorf("missing_project_id: 账户缺少project id，可能无法使用Antigravity")
+	}
+
 	return newCredentials, nil
 }

backend/internal/service/token_refresh_service.go

@@ -163,12 +163,16 @@ func (s *TokenRefreshService) refreshWithRetry(ctx context.Context, account *Acc
 
 	for attempt := 1; attempt <= s.cfg.MaxRetries; attempt++ {
 		newCredentials, err := refresher.Refresh(ctx, account)
-		if err == nil {
-			// 刷新成功，更新账号credentials
+
+		// 如果有新凭证，先更新（即使有错误也要保存 token）
+		if newCredentials != nil {
 			account.Credentials = newCredentials
-			if err := s.accountRepo.Update(ctx, account); err != nil {
-				return fmt.Errorf("failed to save credentials: %w", err)
+			if saveErr := s.accountRepo.Update(ctx, account); saveErr != nil {
+				return fmt.Errorf("failed to save credentials: %w", saveErr)
 			}
+		}
+
+		if err == nil {
 			return nil
 		}
 
@@ -219,6 +223,7 @@ func isNonRetryableRefreshError(err error) bool {
 		"invalid_client",      // 客户端配置错误
 		"unauthorized_client", // 客户端未授权
 		"access_denied",       // 访问被拒绝
+		"missing_project_id",  // 缺少 project_id
 	}
 	for _, needle := range nonRetryable {
 		if strings.Contains(msg, needle) {