feat(xray/outbounds): TCP probe mode + Test All + timing breakdown

- service.TestOutbound now dispatches on `mode`:
  - "tcp": parallel net.DialTimeout to every server/peer endpoint
    (vmess/vless/trojan/ss/socks/http/wireguard). No xray spin-up,
    no semaphore — safe to run concurrently across outbounds.
  - "http" (default): existing temp-xray + SOCKS path, now with an
    httptrace.ClientTrace breakdown (DNS / Connect / TLS / TTFB)
    alongside the total delay and status code.
- testSemaphore renamed to httpTestSemaphore — only HTTP probes
  serialise, TCP runs free.
- TestOutboundResult carries the per-mode extras: timing fields for
  HTTP, per-endpoint dial list for TCP, plus a `mode` echo.
- Controller reads `mode` from the form and passes it through.
- useXraySetting: testOutbound accepts mode (default "tcp"); new
  testAllOutbounds(mode) runs a worker pool (concurrency 8 for TCP,
  1 for HTTP) and skips blackhole / loopback / blocked outbounds —
  also skips freedom / dns under TCP since they have no endpoint.
- OutboundsTab: TCP/HTTP radio toggle and a Test All button land in
  the toolbar; the per-row ⚡ now uses the selected mode. Results
  surface in a popover with the full timing breakdown plus the
  endpoint list for TCP probes. Latency header replaces the duplicate
  "check" column title.

Practical effect: testing ten outbounds in TCP mode drops from ~50–100s
(serial HTTP) to ~1–2s (parallel dial × 8). HTTP mode stays as the
authoritative probe and now shows where the latency actually lives.

frontend/src/pages/xray/XrayPage.vue

@@ -40,21 +40,26 @@ const {
   restartResult,
   outboundsTraffic,
   outboundTestStates,
+  testingAll,
   fetchAll,
   resetOutboundsTraffic,
   testOutbound,
+  testAllOutbounds,
   saveAll,
   resetToDefault,
   restartXray,
   applyOutboundsEvent,
 } = useXraySetting();
 
-// Live outbounds traffic — pushed by xray_traffic_job every ~10s.
 useWebSocket({ outbounds: applyOutboundsEvent });
 
-async function onTestOutbound(idx) {
+async function onTestOutbound(idx, mode = 'tcp') {
   const outbound = templateSettings.value?.outbounds?.[idx];
-  if (outbound) await testOutbound(idx, outbound);
+  if (outbound) await testOutbound(idx, outbound, mode);
+}
+
+async function onTestAllOutbounds(mode = 'tcp') {
+  await testAllOutbounds(mode);
 }
 
 function onDeleteOutbound(idx) {
@@ -278,8 +283,10 @@ function confirmRestart() {
                         <UploadOutlined /> <span>{{ t('pages.xray.Outbounds') }}</span>
                       </template>
                       <OutboundsTab :template-settings="templateSettings" :outbounds-traffic="outboundsTraffic"
-                        :outbound-test-states="outboundTestStates" :inbound-tags="inboundTags" :is-mobile="isMobile"
-                        @reset-traffic="resetOutboundsTraffic" @test="onTestOutbound" @delete="onDeleteOutbound"
+                        :outbound-test-states="outboundTestStates" :testing-all="testingAll"
+                        :inbound-tags="inboundTags" :is-mobile="isMobile"
+                        @reset-traffic="resetOutboundsTraffic" @test="onTestOutbound"
+                        @test-all="onTestAllOutbounds" @delete="onDeleteOutbound"
                         @show-warp="showWarp" @show-nord="showNord" />
                     </a-tab-pane>