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/mohong/views/MohongOrderDetailView.vue

@@ -135,7 +135,7 @@ async function copyText() {
           <h1>{{ statusText }}</h1>
           <p class="sub">订单号 {{ order.order_no }} · {{ formatDateTime(order.created_at) }}</p>
         </div>
-        <button type="button" class="toolbar-btn outline" @click="router.push('/mohong/orders')">
+        <button type="button" class="toolbar-btn outline" @click="router.push('/crash/orders')">
           返回列表
         </button>
       </header>
@@ -207,7 +207,7 @@ async function copyText() {
           <button v-if="order.copy_text" type="button" class="btn outline" @click="copyText">
             复制订单信息
           </button>
-          <button type="button" class="btn outline" @click="router.push('/mohong')">
+          <button type="button" class="btn outline" @click="router.push('/crash')">
             继续选购
           </button>
         </aside>