业务更名为撞车并切换crash路由

用户可见文案与页面/API路径改为撞车与crash，保留mohong表与权限码兼容；移动端入口去掉租/撞图标。

frontend/src/features/admin/views/AdminMohongCategoriesView.vue

@@ -96,7 +96,7 @@ async function handleDelete(item: MohongCategory) {
   <div class="admin-page">
     <div class="page-head">
       <div>
-        <h2>摸大红分类</h2>
+        <h2>撞车分类</h2>
         <p>大红 / 四格大红 / 炫彩等分类，前台左侧筛选使用</p>
       </div>
       <div class="actions">

frontend/src/features/admin/views/AdminMohongConfigView.vue

@@ -49,7 +49,7 @@ async function handleSave() {
 
 async function uploadQrcode(file: File) {
   try {
-    const uploaded = await uploadAdminFile(file, 'mohong')
+    const uploaded = await uploadAdminFile(file, 'crash')
     form.default_qrcode_url = uploaded.url
     ElMessage.success('上传成功')
   } catch (error) {
@@ -63,7 +63,7 @@ async function uploadQrcode(file: File) {
   <div v-loading="loading" class="admin-page">
     <div class="page-head">
       <div>
-        <h2>摸大红配置</h2>
+        <h2>撞车配置</h2>
         <p>全局默认固定二维码与订单复制模板。商品可覆盖默认二维码；支付后用户在订单详情扫码并复制信息联系客服。</p>
       </div>
       <el-button type="primary" :loading="saving" @click="handleSave">保存配置</el-button>

frontend/src/features/admin/views/AdminMohongOrdersView.vue

@@ -85,7 +85,7 @@ async function copyText(text: string) {
   <div class="admin-page">
     <div class="page-head">
       <div>
-        <h2>摸大红订单</h2>
+        <h2>撞车订单</h2>
         <p>查看订单、完成履约、复制用户订单信息</p>
       </div>
       <el-button :icon="Refresh" @click="load">刷新</el-button>

frontend/src/features/admin/views/AdminMohongProductsView.vue

@@ -177,7 +177,7 @@ async function handleDelete(item: MohongProduct) {
 
 async function uploadImage(file: File, target: 'cover' | 'gallery' | 'qrcode') {
   try {
-    const uploaded = await uploadAdminFile(file, 'mohong')
+    const uploaded = await uploadAdminFile(file, 'crash')
     if (target === 'cover') form.cover_url = uploaded.url
     else if (target === 'qrcode') form.qrcode_image_url = uploaded.url
     else form.image_urls.push(uploaded.url)
@@ -197,7 +197,7 @@ function removeGallery(url: string) {
   <div class="admin-page">
     <div class="page-head">
       <div>
-        <h2>摸大红商品</h2>
+        <h2>撞车商品</h2>
         <p>管理商品图片、价格、库存与专属二维码</p>
       </div>
       <div class="actions">