修复开播卡正在连接：移除未定义 quality；画质改官网选择+localStorage

Made-with: Cursor

admin/src/views/sites/LiveBroadcast.vue

@@ -10,17 +10,9 @@
         <code>LIVE_PUBLIC_IP</code>（服务器公网 IPv4，与域名一致），并配置 <code>LIVE_ICE_SERVERS</code>（含 TURN）。
       </p>
       <p class="status">{{ status }}</p>
-      <div v-if="!session" class="quality-row">
-        <span class="quality-label">推流画质</span>
-        <el-select v-model="quality" style="width: 220px" :disabled="!token">
-          <el-option
-            v-for="o in qualityOptions"
-            :key="o.value"
-            :label="o.label"
-            :value="o.value"
-          />
-        </el-select>
-      </div>
+      <p class="quality-hint">
+        画质请在官网「直播」页选择（写入本机）；与后台开播使用<strong>同一浏览器</strong>时，开始直播将按该档位采集。
+      </p>
       <div class="actions">
         <el-button v-if="!session" type="primary" :disabled="!token" @click="start">开始直播</el-button>
         <el-button v-else type="danger" @click="stop">结束直播</el-button>
@@ -34,7 +26,7 @@
 import { ref, computed, onMounted, onUnmounted } from 'vue'
 import { onBeforeRouteLeave } from 'vue-router'
 import { useAuthStore } from '../../stores/auth'
-import { startPublishing, LIVE_QUALITY_OPTIONS } from '../../utils/liveWebRTC'
+import { startPublishing } from '../../utils/liveWebRTC'
 
 const authStore = useAuthStore()
 const token = computed(() => authStore.getToken() || '')
@@ -50,7 +42,6 @@ function start() {
   status.value = '正在连接…'
   const { stop } = startPublishing({
     token: token.value,
-    quality: quality.value,
     onStatus: (s) => {
       status.value = s
     },
@@ -108,15 +99,11 @@ onBeforeRouteLeave(() => {
   margin-bottom: 12px;
   min-height: 1.5em;
 }
-.quality-row {
-  display: flex;
-  align-items: center;
-  gap: 12px;
-  margin-bottom: 12px;
-}
-.quality-label {
-  font-size: 14px;
-  color: #606266;
+.quality-hint {
+  font-size: 13px;
+  line-height: 1.6;
+  color: #909399;
+  margin: 0 0 14px;
 }
 .actions {
   margin-bottom: 16px;