发布流程增加解锁赛伊德与腾讯安全中心截图教程

- 解锁赛伊德：皮肤与交接分区新增是/否必选项，存入 asset_summary，
  仅当号主选「是」时在买家端列表/详情展示「解锁赛伊德：是」
- 腾讯安全中心截图：新增可复用 GuideImage 组件（缩略图 + 点击全屏放大），
  在该截图槽位展示处罚截图教程图，仅提示用途、不占用上传数量

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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

@@ -6,6 +6,8 @@ import MobileBottomNav from '@/components/MobileBottomNav.vue'
 import { usePublishForm } from '@/features/seller/composables/usePublishForm'
 import { formatMoney } from '@/shared/utils/money'
 import type { AgreementContent } from '@/features/listings/api/listingOptions'
+import GuideImage from '@/components/GuideImage.vue'
+import tencentSecurityGuide from '@/assets/tencent-security-guide.webp'
 
 const {
   commonOnlineTimes,
@@ -115,6 +117,13 @@ function openPublishAgreement(agreement: AgreementContent) {
 function selectRadio<T extends string>(value: T, setter: (value: T) => void) {
   setter(value)
 }
+
+const unlockSaidOptions = ['是', '否']
+
+// 截图槽位的指导示例图（仅展示、点击放大，不占用上传数量）
+const screenshotGuides: Record<string, string> = {
+  tencentSecurity: tencentSecurityGuide,
+}
 </script>
 
 <template>
@@ -356,6 +365,23 @@ function selectRadio<T extends string>(value: T, setter: (value: T) => void) {
           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">
+          <template #input>
+            <div class="radio-group">
+              <button
+                v-for="opt in unlockSaidOptions"
+                :key="opt"
+                type="button"
+                class="radio-btn"
+                :class="{ active: form.unlock_said === opt }"
+                @click="selectRadio(opt, value => (form.unlock_said = value))"
+              >
+                {{ opt }}
+              </button>
+            </div>
+          </template>
+        </van-field>
+
         <div class="time-row">
           <div class="time-field-group">
             <van-field
@@ -487,6 +513,11 @@ function selectRadio<T extends string>(value: T, setter: (value: T) => void) {
               <small v-if="getScreenshotLimitHint(slot.key)">{{
                 getScreenshotLimitHint(slot.key)
               }}</small>
+              <GuideImage
+                v-if="screenshotGuides[slot.key]"
+                :src="screenshotGuides[slot.key] || ''"
+                label="点击查看处罚截图教程"
+              />
             </div>
             <div v-if="getScreenshotCount(slot.key)" class="upload-preview-list">
               <div