🗑️ feat(token): implement batch token deletion API & front-end integration

• Back-end
  • model/token.go
    • Add `BatchDeleteTokens(ids []int, userId int)` – transactional DB removal + async Redis cache cleanup.
  • controller/token.go
    • Introduce `TokenBatch` DTO and `DeleteTokenBatch` handler calling the model layer; returns amount deleted.
  • router/api-router.go
    • Register `POST /api/token/batch` route (user-scoped).

• Front-end (TokensTable.js)
  • Replace per-token deletion loops with single request to `/api/token/batch`.
  • Display dynamic i18n message: “Deleted {{count}} tokens!”.
  • Add modal confirmation:
    • Title “Batch delete token”.
    • Content “Are you sure you want to delete the selected {{count}} tokens?”.
  • UI/UX tweaks
    • Responsive button group (flex-wrap, mobile line-break).
    • Clear `selectedKeys` after refresh / successful deletion to avoid ghost selections.

• i18n
  • Ensure placeholder style matches translation keys (`{{count}}`).

This commit delivers efficient, scalable token management and an improved user experience across devices.

router/api-router.go

@@ -125,6 +125,7 @@ func SetApiRouter(router *gin.Engine) {
 			tokenRoute.POST("/", controller.AddToken)
 			tokenRoute.PUT("/", controller.UpdateToken)
 			tokenRoute.DELETE("/:id", controller.DeleteToken)
+			tokenRoute.POST("/batch", controller.DeleteTokenBatch)
 		}
 		redemptionRoute := apiRouter.Group("/redemption")
 		redemptionRoute.Use(middleware.AdminAuth())