feat(ui): show per-inbound live speed (#5261)

* feat(utils): add speedFormat utility and tests

* feat(inbounds): add InboundSpeedEntry type

* feat(inbounds): add speed column to inbound list

* feat(inbounds): show speed in inbound stats modal

* feat(inbounds): compute inbound speed from traffic deltas

* feat(inbounds): wire inbound speed through page

* feat(i18n): add speed translation for all locales

* refactor(inbounds): dedupe live-speed UI and harden formatting

Extract a shared InboundSpeedTag component and isActiveSpeed guard used by the speed column and stats modal, unify InboundSpeedEntry into a single type, and route speedFormat through sizeFormat.

Also guard sizeFormat against non-finite input (no more "NaN PB/s") and clear stale per-inbound speeds when a traffic poll returns no deltas.

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

internal/web/translation/zh-CN.json

@@ -289,6 +289,7 @@
       "port": "端口",
       "portMap": "端口映射",
       "traffic": "流量",
+      "speed": "速度",
       "details": "详细信息",
       "transportConfig": "传输",
       "expireDate": "到期时间",