feat(ui): add per-user volume controls (#17)

apps/chanora_flutter/lib/l10n/app_zh.arb

@@ -126,6 +126,7 @@
   "channelJoinFailedFamilyFull": "频道家族人数已达上限。",
   "channelJoinFailedPrivate": "此频道为私有频道。",
   "channelJoinFailedTimeout": "无法加入频道：服务器响应超时。",
+  "channelJoinFailedFlooding": "切换频道过于频繁，请稍后再试。",
   "channelJoinFailedGeneric": "无法加入频道：{message}",
   "@channelJoinFailedGeneric": {
     "placeholders": {
@@ -233,5 +234,11 @@
       "message": { "type": "String" }
     }
   },
+  "clientVolumeAction": "用户音量",
+  "clientVolumeTitle": "{name} — 音量",
+  "clientVolumeLabel": "{percent}%",
+  "clientVolumeMuteAction": "静音该用户",
+  "clientVolumeUnmuteAction": "取消静音",
+  "clientVolumeResetAction": "恢复默认",
   "permissionDenied": "权限被拒绝"
 }