feat(ui): add select all / clear all shortcuts for inbound multi-select (#5175)

* feat(ui): add select all / clear all shortcuts for inbound multi-select

Adds 'Select all' and 'Clear all' buttons above the inbound multi-select in:
- ClientFormModal (add/edit client)
- BulkAttachInboundsModal (bulk attach clients to inbounds)
- BulkDetachInboundsModal (bulk detach clients from inbounds)
- ClientBulkAddModal (add bulk clients)

Extracts the repeated button logic into a reusable SelectAllClearButtons component.

Includes i18n keys for all 13 supported languages with proper translations.

Closes #5144

* refactor(form): decouple SelectAllClearButtons labels and harden select-all

Accept optional selectAllLabel/clearLabel props so the generic form component is not tied to the client-inbound i18n keys (defaults unchanged). Compute the all-selected state by checking every option is present and union the current value on select-all, so it stays correct if value holds ids outside options.

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Co-authored-by: Sanaei <ho3ein.sanaei@gmail.com>

internal/web/translation/zh-CN.json

@@ -703,6 +703,8 @@
       "duration": "时长",
       "attachedInbounds": "关联入站",
       "selectInbound": "选择一个或多个入站",
+      "selectAllInbounds": "全选",
+      "clearAllInbounds": "全部清除",
       "noSubId": "该客户端没有 subId，无法生成共享链接。",
       "noLinks": "没有可共享的链接 — 请先将此客户端关联到支持协议的入站。",
       "link": "链接",