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/chats/api/chats.ts

@@ -14,7 +14,7 @@ export interface ChatParticipant {
   joined_at: string
 }
 
-export type SupportScene = 'general' | 'mohong'
+export type SupportScene = 'general' | 'crash'
 
 export interface ChatConversation {
   id: number
@@ -42,15 +42,19 @@ export interface ChatConversation {
   updated_at: string
 }
 
-/** 根据当前路由推断客服场景：摸大红页 → mohong，其它 → general */
+/** 根据当前路由推断客服场景：撞车页 → crash，其它 → general */
 export function resolveSupportScene(path: string): SupportScene {
   if (
+    path === '/crash' ||
+    path.startsWith('/crash/') ||
+    path === '/m/crash' ||
+    path.startsWith('/m/crash/') ||
     path === '/mohong' ||
     path.startsWith('/mohong/') ||
     path === '/m/mohong' ||
     path.startsWith('/m/mohong/')
   ) {
-    return 'mohong'
+    return 'crash'
   }
   return 'general'
 }