feat(antigravity): 自动设置隐私并支持后台手动重试

新增 Antigravity OAuth 隐私设置能力，在账号创建、刷新、导入和后台
Token 刷新路径自动调用 setUserSettings + fetchUserInfo 关闭遥测；
持久化后同步内存 Extra，错误处理改为日志记录。

Made-with: Cursor

backend/internal/handler/admin/account_data.go

@@ -267,6 +267,9 @@ func (h *AccountHandler) importData(ctx context.Context, req DataImportRequest)
 		}
 	}
 
+	// 收集需要异步设置隐私的 Antigravity OAuth 账号
+	var privacyAccounts []*service.Account
+
 	for i := range dataPayload.Accounts {
 		item := dataPayload.Accounts[i]
 		if err := validateDataAccount(item); err != nil {
@@ -314,7 +317,8 @@ func (h *AccountHandler) importData(ctx context.Context, req DataImportRequest)
 			SkipDefaultGroupBind: skipDefaultGroupBind,
 		}
 
-		if _, err := h.adminService.CreateAccount(ctx, accountInput); err != nil {
+		created, err := h.adminService.CreateAccount(ctx, accountInput)
+		if err != nil {
 			result.AccountFailed++
 			result.Errors = append(result.Errors, DataImportError{
 				Kind:    "account",
@@ -323,9 +327,30 @@ func (h *AccountHandler) importData(ctx context.Context, req DataImportRequest)
 			})
 			continue
 		}
+		// 收集 Antigravity OAuth 账号，稍后异步设置隐私
+		if created.Platform == service.PlatformAntigravity && created.Type == service.AccountTypeOAuth {
+			privacyAccounts = append(privacyAccounts, created)
+		}
 		result.AccountCreated++
 	}
 
+	// 异步设置 Antigravity 隐私，避免大量导入时阻塞请求
+	if len(privacyAccounts) > 0 {
+		adminSvc := h.adminService
+		go func() {
+			defer func() {
+				if r := recover(); r != nil {
+					slog.Error("import_antigravity_privacy_panic", "recover", r)
+				}
+			}()
+			bgCtx := context.Background()
+			for _, acc := range privacyAccounts {
+				adminSvc.ForceAntigravityPrivacy(bgCtx, acc)
+			}
+			slog.Info("import_antigravity_privacy_done", "count", len(privacyAccounts))
+		}()
+	}
+
 	return result, nil
 }