fix(ticket): implicit executor for default-flow tickets

- list is_executor and ExecuteTicket both required an execute-step
  approval record; tickets created without a workflow (default flow)
  had none, so the execute button never appeared and the API returned
  403 for everyone - admin/dba are now implicit executors (approved
  status only, consistent in both list enrichment and execution check)
- status labels: pending/reviewing/approved were all shown as 审核中;
  now 待初审/审批中/待执行 so the ready-to-execute state is visible
- verified end-to-end on test backend: create -> quick review dialog
  with comment -> impact-summary execute confirm -> success, detail
  page stage steps reach 完成 with execute result visible

backend/internal/handler/ticket.go

@@ -143,6 +143,10 @@ func ListTickets(c *gin.Context) {
 		model.DB.Model(&model.TicketApproval{}).Where("ticket_id = ? AND step_type = 'execute'", t.ID).Count(&execCount)
 		var isExec, isAppr int64
 		model.DB.Model(&model.TicketApproval{}).Where("ticket_id = ? AND step_type = 'execute' AND approver_id = ?", t.ID, userID).Count(&isExec)
+		// 无执行步配置的工单(默认流程):approved 状态下 admin/dba 为隐式执行人
+		if isExec == 0 && execCount == 0 && (role == "admin" || role == "dba") && t.Status != nil && *t.Status == "approved" {
+			isExec = 1
+		}
 		// Only count PENDING approvals (action IS NULL) — already-approved records should not show approve button
 		model.DB.Model(&model.TicketApproval{}).Where("ticket_id = ? AND step_type != 'execute' AND step_type != 'submit' AND approver_id = ? AND action IS NULL", t.ID, userID).Count(&isAppr)
 		result = append(result, TicketWithMeta{
@@ -569,8 +573,14 @@ func ExecuteTicket(c *gin.Context) {
 		Where("ticket_id = ? AND step_type = 'execute' AND (approver_id = ? OR approver_id IS NULL)", id, userID).
 		Count(&executorCheck)
 	if executorCheck == 0 {
-		resp.Forbidden(c, "你不是此工单的执行人")
-		return
+		// 无执行步配置的工单(默认流程):admin/dba 为隐式执行人(与列表 is_executor 判定一致)
+		var execStepCount int64
+		model.DB.Model(&model.TicketApproval{}).Where("ticket_id = ? AND step_type = 'execute'", id).Count(&execStepCount)
+		_, _, role := middleware.GetCurrentUser(c)
+		if execStepCount > 0 || (role != "admin" && role != "dba") {
+			resp.Forbidden(c, "你不是此工单的执行人")
+			return
+		}
 	}
 
 	var pendingExec model.TicketApproval

frontend/src/features/ticket/constants.ts

@@ -5,9 +5,9 @@
 
 /** 展示用状态映射 — 按用户要求简化 */
 export const displayStatusMap: Record<string, string> = {
-  pending: '审核中',
-  reviewing: '审核中',
-  approved: '审核中',
+  pending: '待初审',
+  reviewing: '审批中',
+  approved: '待执行',
   rejected: '已拒绝',
   executing: '执行中',
   success: '完成',