feat(seller): 微信区上号方式与账号密码互斥，自动固定为扫码

frontend/src/features/seller/views/MobileSellerListingCreateView.vue

@@ -38,7 +38,8 @@ const {
   rankOptions,
   insuranceOptions,
   levelOptions,
-  loginMethodOptions,
+  effectiveLoginMethodOptions,
+  isScanOnlyServer,
   regionOptions,
   banRecordOptions,
   skinGroups,
@@ -383,7 +384,7 @@ const screenshotGuides: Record<string, string> = {
           <template #input>
             <div class="radio-group">
               <button
-                v-for="opt in loginMethodOptions"
+                v-for="opt in effectiveLoginMethodOptions"
                 :key="opt"
                 type="button"
                 class="radio-btn"
@@ -396,7 +397,11 @@ const screenshotGuides: Record<string, string> = {
           </template>
         </van-field>
         <p class="field-hint">
-          优先推荐【账密登录】，出售速度约为扫码的数倍，两种方式安全性一致，账密登录更便捷，请自行衡量
+          {{
+            isScanOnlyServer
+              ? '微信账号仅支持扫码登录，上号方式固定为扫码。'
+              : '优先推荐【账密登录】，出售速度约为扫码的数倍，两种方式安全性一致，账密登录更便捷，请自行衡量'
+          }}
         </p>
 
         <van-field label="解锁赛伊德" required class="publish-field">