feat(clients): add bulk enable/disable and move selection actions into More menu

Add bulkEnable/bulkDisable named endpoints backed by a shared internal impl, and consolidate the per-selection actions (attach, detach, add to group, ungroup, enable, disable, adjust, sub links) into the clients table's More dropdown so the toolbar only shows the selection count and delete. Translate the new enable/disable confirm dialogs and toasts across all 13 locales.

internal/web/translation/zh-CN.json

@@ -816,6 +816,12 @@
       "attach": "附加",
       "adjust": "调整",
       "subLinks": "订阅链接",
+      "enable": "启用",
+      "disable": "禁用",
+      "bulkEnableConfirmTitle": "启用 {count} 个客户端？",
+      "bulkEnableConfirmContent": "在每个已附加的入站上启用所选的客户端。配额已用尽或已过期的客户端将被自动重新禁用。",
+      "bulkDisableConfirmTitle": "禁用 {count} 个客户端？",
+      "bulkDisableConfirmContent": "在每个已附加的入站上禁用所选的客户端。他们将立即失去访问权限，但其记录和流量将被保留。",
       "selectedCount": "已选 {count} 项",
       "attachSelected": "附加 ({count})",
       "attachToInboundsTitle": "将 {count} 个客户端附加到入站",
@@ -872,6 +878,10 @@
         "allTrafficsReset": "所有客户端流量已重置",
         "bulkDeleted": "已删除 {count} 个客户端",
         "bulkDeletedMixed": "已删除 {ok} 个，失败 {failed} 个",
+        "bulkEnabled": "已启用 {count} 个客户端",
+        "bulkEnabledMixed": "已启用 {ok} 个，失败 {failed} 个",
+        "bulkDisabled": "已禁用 {count} 个客户端",
+        "bulkDisabledMixed": "已禁用 {ok} 个，失败 {failed} 个",
         "bulkCreated": "已创建 {count} 个客户端",
         "bulkCreatedMixed": "已创建 {ok} 个，失败 {failed} 个",
         "bulkAdjusted": "已调整 {count} 个客户端",