P9(4): remove local-core live-test trio — outbound speed test + egress probe, restart/stop xray endpoints

Per user decision 2026-10-21 (reverses the earlier keep call in
PANEL-LITE-SPEC.md, now amended): the lite panel never runs a local
core, so measuring/probing from the panel host is meaningless.

Backend:
- delete service/outbound probe implementation (probe_http.go and its
  tests) and the TestOutbound/TestOutbounds batch prober; outbound
  traffic accounting (AddTraffic/GetOutboundsTraffic/Reset) unchanged
- drop POST /panel/api/xray/testOutbound + testOutbounds routes and the
  outboundTestUrl setting (get/update plumbing removed; stored rows in
  existing DBs are inert)
- drop POST /panel/api/server/restartXrayService + stopXrayService
  routes/handlers and the node-sync allowlist entry; the service-level
  Stop/RestartXrayService stay for internal import/restore flows
- node-sync allowlist contract test updated to the new inventory

Frontend:
- remove test buttons/mode switch/test-all from outbounds tab, card
  list and table columns; delete TestResultPopover and CountryPill;
  drop the egress/country/latency columns fed by probe results
- remove outboundTestUrl state and save plumbing from useXraySetting
  and the Basics tab field; drop OutboundTestResult schemas
- delete the 15 now-dead i18n keys from all 13 locales (incl. the
  restart/stop keys orphaned since P6/P7 — i18n-dead-keys test green)
- tests: drop the test-URL hook test, re-probe the loopback index
  mapping through Move-to-top, regenerate API types (gen)

internal/web/translation/ja-JP.json

@@ -1180,10 +1180,6 @@
       "metricsListenDesc": "この アドレス:ポート で Xray の Prometheus 形式メトリクスを公開します（例: 127.0.0.1:11111）。空欄にすると無効になります。認証されないため、localhost にバインドしてリバースプロキシ経由で公開してください。",
       "metricsTag": "メトリクスタグ",
       "save": "保存",
-      "restartSuccess": "Xrayの再起動に成功しました",
-      "stopSuccess": "Xrayが正常に停止しました",
-      "restartError": "Xrayの再起動中にエラーが発生しました。",
-      "stopError": "Xrayの停止中にエラーが発生しました。",
       "basicTemplate": "基本設定",
       "advancedTemplate": "高度な設定",
       "generalConfigs": "一般設定",
@@ -1206,8 +1202,6 @@
       "FreedomHappyEyeballsTryDelayDesc": "別のアドレスファミリを試すまでのミリ秒。150〜250 ms が目安です。",
       "RoutingStrategy": "ルーティングドメイン戦略設定",
       "RoutingStrategyDesc": "DNS解決の全体的なルーティング戦略を設定する",
-      "outboundTestUrl": "アウトバウンドテスト URL",
-      "outboundTestUrlDesc": "アウトバウンド接続テストに使用する URL。既定値",
       "Torrent": "BitTorrent プロトコルをブロック",
       "Inbounds": "インバウンド",
       "Outbounds": "アウトバウンド",
@@ -1355,18 +1349,9 @@
       },
       "outbound": {
         "tag": "タグ",
-        "egress": "Egress",
-        "egressHint": "Run an HTTP test to show egress IP and country.",
         "outboundStatus": "アウトバウンドステータス",
         "sendThrough": "送信経路",
         "targetStrategy": "ターゲット解決戦略",
-        "modeRealDelay": "実際の遅延",
-        "testModeTooltip": "TCP: 高速 dial-only プローブ。HTTP: xray を経由した完全リクエスト。実際の遅延: 接続確立を含む合計時間。",
-        "testAll": "すべてテスト",
-        "httpStatus": "HTTPステータス",
-        "breakdownConnect": "プロキシ接続",
-        "breakdownTls": "アウトバウンド経由のTLS",
-        "breakdownTtfb": "最初のバイト",
         "country": "国",
         "server": "サーバー",
         "city": "都市",
@@ -1675,4 +1660,4 @@
     "noIpRecord": "❗ IPレコードがありません！"
   },
   "email": {}
-}
+}