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/ar-EG.json

@@ -1172,10 +1172,6 @@
     },
     "xray": {
       "save": "احفظ",
-      "restartSuccess": "تم إعادة تشغيل Xray بنجاح",
-      "stopSuccess": "تم إيقاف Xray بنجاح",
-      "restartError": "حدث خطأ أثناء إعادة تشغيل Xray.",
-      "stopError": "حدث خطأ أثناء إيقاف Xray.",
       "basicTemplate": "أساسي",
       "advancedTemplate": "متقدم",
       "generalConfigs": "إعدادات عامة",
@@ -1198,8 +1194,6 @@
       "FreedomHappyEyeballsTryDelayDesc": "عدد المللي ثانية قبل تجربة عائلة العناوين البديلة. 150–250 مللي ثانية نقطة بداية جيدة.",
       "RoutingStrategy": "استراتيجية التوجيه العامة",
       "RoutingStrategyDesc": "حدد استراتيجية التوجيه الإجمالية لحل كل الطلبات.",
-      "outboundTestUrl": "رابط اختبار المخرج",
-      "outboundTestUrlDesc": "الرابط المستخدم عند اختبار اتصال المخرج",
       "Torrent": "حظر بروتوكول التورنت",
       "Inbounds": "الواردات",
       "Outbounds": "الصادرات",
@@ -1355,18 +1349,9 @@
       },
       "outbound": {
         "tag": "الوسم",
-        "egress": "Egress",
-        "egressHint": "Run an HTTP test to show egress IP and country.",
         "outboundStatus": "حالة المخرج",
         "sendThrough": "أرسل من خلال",
         "targetStrategy": "استراتيجية الوجهة",
-        "modeRealDelay": "التأخير الفعلي",
-        "testModeTooltip": "TCP: فحص dial سريع. HTTP: طلب كامل عبر xray. التأخير الفعلي: الوقت الكامل شاملاً إنشاء الاتصال.",
-        "testAll": "اختبار الكل",
-        "httpStatus": "حالة HTTP",
-        "breakdownConnect": "اتصال البروكسي",
-        "breakdownTls": "TLS عبر الصادر",
-        "breakdownTtfb": "أول بايت",
         "country": "الدولة",
         "server": "الخادم",
         "city": "المدينة",
@@ -1675,4 +1660,4 @@
     "noIpRecord": "❗ لا يوجد سجل IP!"
   },
   "email": {}
-}
+}