feat(inbounds): add multi-select and bulk delete

Mirror the clients page: checkbox selection on the desktop table and on
mobile cards, with a danger Delete button in the toolbar that removes all
selected inbounds in one call.

Backend adds POST /panel/api/inbounds/bulkDel, which loops the existing
DelInbound per id (xray restarts at most once) and returns {deleted,
skipped}. Frontend shows a confirm modal plus a result toast, clears the
selection on success, adds bulk-delete i18n keys across all 13 languages,
and documents the endpoint in the in-panel API docs.

web/translation/zh-TW.json

@@ -296,6 +296,10 @@
       "deleteConfirmContent": "將刪除此入站及其所有客戶端。此操作無法復原。",
       "resetConfirmTitle": "重置「{remark}」的流量？",
       "resetConfirmContent": "將此入站的上/下行計數器歸零。",
+      "selectedCount": "已選 {count} 項",
+      "selectAll": "全選",
+      "bulkDeleteConfirmTitle": "刪除 {count} 個入站？",
+      "bulkDeleteConfirmContent": "將刪除所選入站及其所有客戶端。此操作無法復原。",
       "cloneConfirmTitle": "複製入站「{remark}」？",
       "cloneConfirmContent": "使用新連接埠和空客戶端清單建立副本。",
       "delAllClients": "刪除所有客戶端",
@@ -421,6 +425,8 @@
         "inboundsUpdateSuccess": "入站連接已成功更新",
         "inboundUpdateSuccess": "入站連接已成功更新",
         "inboundCreateSuccess": "入站連接已成功建立",
+        "bulkDeleted": "已刪除 {count} 個入站",
+        "bulkDeletedMixed": "已刪除 {ok} 個，失敗 {failed} 個",
         "inboundDeleteSuccess": "入站連接已成功刪除",
         "inboundClientAddSuccess": "已新增入站客戶端",
         "inboundClientDeleteSuccess": "入站客戶端已刪除",