feat: Add team process API.

backend/internal/api/team_process.go

@@ -486,10 +486,43 @@ func processSingleTeam(idx int, req TeamProcessRequest) (result TeamProcessResul
 		}
 	}
 
+	// Step 0: 预检查账户状态（封禁/Token过期检测）
+	resolvedProxy := database.Instance.ResolveProxy(req.Proxy)
+	preChecker := invite.NewWithProxy(owner.Token, resolvedProxy)
+	accountStatus := preChecker.CheckAccountStatus()
+
+	if accountStatus.Status == "banned" {
+		logger.Error(fmt.Sprintf("%s 母号被封禁，跳过处理: %s", logPrefix, accountStatus.Error), owner.Email, "team")
+		if database.Instance != nil {
+			database.Instance.MarkOwnerAsInvalid(owner.Email)
+			database.Instance.DeleteTeamOwnerByEmail(owner.Email)
+			logger.Info(fmt.Sprintf("%s 封禁母号已删除: %s", logPrefix, owner.Email), owner.Email, "team")
+		}
+		result.Errors = append(result.Errors, "账户被封禁")
+		result.DurationMs = time.Since(startTime).Milliseconds()
+		return result
+	}
+
+	if accountStatus.Status == "token_expired" {
+		logger.Error(fmt.Sprintf("%s Token已过期，跳过处理", logPrefix), owner.Email, "team")
+		if database.Instance != nil {
+			database.Instance.MarkOwnerAsInvalid(owner.Email)
+			database.Instance.DeleteTeamOwnerByEmail(owner.Email)
+			logger.Info(fmt.Sprintf("%s Token过期母号已删除: %s", logPrefix, owner.Email), owner.Email, "team")
+		}
+		result.Errors = append(result.Errors, "Token已过期")
+		result.DurationMs = time.Since(startTime).Milliseconds()
+		return result
+	}
+
+	if accountStatus.Status == "error" {
+		logger.Warning(fmt.Sprintf("%s 账户状态检查失败: %s，继续尝试", logPrefix, accountStatus.Error), owner.Email, "team")
+	} else {
+		logger.Info(fmt.Sprintf("%s 账户状态正常: %s", logPrefix, accountStatus.PlanType), owner.Email, "team")
+	}
+
 	// Step 1: 获取 Team ID（优先使用已存储的 account_id）
 	var teamID string
-	// Resolve proxy for inviter
-	resolvedProxy := database.Instance.ResolveProxy(req.Proxy)
 	inviter := invite.NewWithProxy(owner.Token, resolvedProxy)
 
 	if owner.AccountID != "" {