补上真正日常要点的那个动作：切换策略组当前选中谁

之前的面板只做了「这个入站指向哪个出站」，那是改配置文件。但 metacubexd 里点一条线路
改的根本不是入站，是策略组的当前选中——调 PUT /proxies/{组}，不写文件、立刻生效。
mixed-port 走规则表，末尾 MATCH,PROXY 把流量交给 PROXY 组，所以换那个组的选中就等于
换了这个端口的出口。这是每天都要点的动作，之前整个漏了。

面板顶部现在显示完整链条（PROXY → AUTO → 某条线路），并让人在最后一个策略组上换选中。
只显示第一层等于没回答「这个端口现在走哪条线」。

透传的白名单里为此开了唯一一个写操作，单独一条路由而不是放开整个转发。

web/views/InboundDetail.vue

@@ -13,13 +13,49 @@ const props = defineProps<{
   groups: string[]
   ownProxies: string[]
   providerLines: string[]
+  /** 流量最终交给哪个出站。走规则的入站要查到规则表末尾的 MATCH */
+  destination: string | null
   /** 运行时状态，键是出站名字。内核没连接时是空的 */
   runtime: Record<string, ProxyInfo>
   kernelOnline: boolean
   saving: boolean
 }>()
 
-const emit = defineEmits<{ pick: [mode: OutboundMode]; edit: []; remove: []; convert: [] }>()
+const emit = defineEmits<{
+  pick: [mode: OutboundMode]
+  edit: []
+  remove: []
+  convert: []
+  select: [group: string, member: string]
+}>()
+
+/**
+ * 从落脚的出站一路跟着「当前选中」往下走，直到走到一条真正的线路。
+ *
+ * 策略组可以选中另一个策略组，所以「这个端口现在走哪条线」往往要跳好几层：
+ * PROXY 选了 AUTO，AUTO 选了某条线路。只显示第一层等于没回答问题。
+ */
+function resolveChain(start: string | null): string[] {
+  const chain: string[] = []
+  let cursor = start
+  while (cursor && !chain.includes(cursor)) {
+    chain.push(cursor)
+    cursor = props.runtime[cursor]?.now ?? null
+  }
+  return chain
+}
+
+const chain = computed(() => resolveChain(props.destination))
+
+/** 链条上最后一个还是策略组的环节——用户能在这里换选中。 */
+const switchable = computed(() => {
+  for (let i = chain.value.length - 1; i >= 0; i -= 1) {
+    const name = chain.value[i]!
+    const info = props.runtime[name]
+    if (info?.all?.length) return { group: name, members: info.all, now: info.now ?? '' }
+  }
+  return null
+})
 
 interface Option {
   key: string
@@ -130,6 +166,35 @@ function delayClass(ms: number | null): string {
       </dl>
     </header>
 
+    <section v-if="chain.length" class="pick">
+      <h3>流量去向</h3>
+      <p class="chain mono">
+        <template v-for="(hop, i) in chain" :key="hop">
+          <span v-if="i" class="arrow">→</span><span :class="i === chain.length - 1 && 'tail'">{{ hop }}</span>
+        </template>
+      </p>
+
+      <template v-if="switchable">
+        <h4>{{ switchable.group }} 当前选中</h4>
+        <div class="grid">
+          <button
+            v-for="m in switchable.members"
+            :key="m"
+            type="button"
+            :class="['card', m === switchable.now && 'is-on']"
+            :disabled="saving"
+            @click="emit('select', switchable.group, m)"
+          >
+            <span class="card-name">{{ m }}</span>
+            <span class="card-sub">{{ runtime[m]?.now ? `${runtime[m]!.type}(${runtime[m]!.now})` : (runtime[m]?.type ?? '—') }}</span>
+            <span :class="['card-delay', delayClass(latestDelay(runtime[m]))]">
+              {{ latestDelay(runtime[m]) === null ? '' : `${latestDelay(runtime[m])} ms` }}
+            </span>
+          </button>
+        </div>
+      </template>
+    </section>
+
     <section class="pick">
       <h3>出站</h3>
 
@@ -351,6 +416,30 @@ function delayClass(ms: number | null): string {
   padding-top: var(--s-4);
 }
 
+.pick + .pick {
+  margin-top: var(--s-5);
+  border-top: 1px solid var(--c-border);
+}
+
+.chain {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: var(--s-2);
+  font-size: var(--t-sm);
+  color: var(--c-text-soft);
+  margin-bottom: var(--s-2);
+}
+
+.chain .arrow {
+  color: var(--c-text-faint);
+}
+
+.chain .tail {
+  color: var(--c-accent-text);
+  font-weight: 500;
+}
+
 h3 {
   font-size: var(--t-sm);
   font-weight: 600;

web/views/RouterPage.vue

@@ -1,6 +1,11 @@
 <script setup lang="ts">
 import { computed, onMounted, ref, watch } from 'vue'
-import { collectInbounds, collectOutboundNames, outboundToProxyField } from '@shared/inbounds.ts'
+import {
+  collectInbounds,
+  collectOutboundNames,
+  outboundToProxyField,
+  resolveDestination,
+} from '@shared/inbounds.ts'
 import type { Inbound, OutboundMode } from '@shared/inbounds.ts'
 import type { ConfigObject } from '../../vendor/config-editor/index.ts'
 import { ApiError, api } from '../api'
@@ -162,6 +167,24 @@ async function submitForm(entry: ConfigObject) {
   if (editingIndex === null) selectedId.value = `listener:${String(listeners.length - 1)}`
 }
 
+/** 切换策略组当前选中谁。运行时动作，不写配置文件，所以不走那条落盘链路。 */
+async function selectMember(group: string, member: string) {
+  if (saving.value) return
+  saving.value = true
+  failure.value = null
+  done.value = ''
+  try {
+    await api.selectProxy(group, member)
+    done.value = `${group} 切到了 ${member}`
+    emit('changed')
+  } catch (error) {
+    const message = error instanceof ApiError ? String(error.payload.error ?? error.message) : String(error)
+    failure.value = { message, hint: '这一步只改内核的运行状态，配置文件没有被动过。' }
+  } finally {
+    saving.value = false
+  }
+}
+
 async function removeSelected() {
   const target = selected.value
   if (!target || target.listenerIndex === null || saving.value) return
@@ -235,6 +258,7 @@ async function removeSelected() {
         :groups="outbounds.groups"
         :own-proxies="outbounds.ownProxies"
         :provider-lines="providerLines"
+        :destination="resolveDestination(data, selected)"
         :runtime="runtime"
         :kernel-online="kernelOnline"
         :saving="saving"
@@ -242,6 +266,7 @@ async function removeSelected() {
         @edit="openEdit"
         @remove="removeSelected"
         @convert="openConvert"
+        @select="selectMember"
       />
     </div>