feat: 实现自适应路由切换，根据 User-Agent 及屏幕大小自动导航 PC/Mobile 视图

frontend/src/router/index.ts

@@ -5,7 +5,7 @@ import { useSessionStore } from '@/stores/session'
 import { getAccessToken, getLoginPath } from '@/utils/authStorage'
 import { accountRoutes } from './accountRoutes'
 import { adminRoutes } from './adminRoutes'
-import { isMobileHost, toMobilePath } from './mobileHost'
+import { isMobileHost, isMobileDevice, getMobilePath, getPcPath } from './mobileHost'
 import { mobileRoutes } from './mobileRoutes'
 import { publicRoutes } from './publicRoutes'
 import { sellerRoutes } from './sellerRoutes'
@@ -22,8 +22,18 @@ const router = createRouter({
 })
 
 router.beforeEach(async (to) => {
-  if (isMobileHost() && to.path !== toMobilePath(to.path)) {
-    return { path: toMobilePath(to.path), query: to.query, hash: to.hash }
+  const isMobile = isMobileHost() || isMobileDevice()
+
+  if (isMobile) {
+    const targetPath = getMobilePath(to.path)
+    if (to.path !== targetPath) {
+      return { path: targetPath, query: to.query, hash: to.hash }
+    }
+  } else {
+    const targetPath = getPcPath(to.path)
+    if (to.path !== targetPath) {
+      return { path: targetPath, query: to.query, hash: to.hash }
+    }
   }
 
   if (to.meta.requiresAuth) {

frontend/src/router/mobileHost.ts

@@ -2,12 +2,72 @@ export function isMobileHost(hostname = window.location.hostname) {
   return hostname === "m.localhost" || hostname.startsWith("m.");
 }
 
-export function toMobilePath(path: string) {
-  if (path === "/") {
+export function isMobileDevice() {
+  if (typeof window === "undefined" || !window.navigator) return false;
+  const ua = window.navigator.userAgent;
+  const isMobileUA = /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(ua);
+  const isSmallScreen = window.innerWidth < 768;
+  return isMobileUA || isSmallScreen;
+}
+
+export function getMobilePath(path: string): string {
+  if (path === "/" || path === "") {
     return "/m";
   }
-  if (path === "/m" || path.startsWith("/m/") || path.startsWith("/admin")) {
+  if (path.startsWith("/m") || path.startsWith("/admin")) {
     return path;
   }
+  
+  if (path === "/listings" || path.startsWith("/listings/")) {
+    return `/m${path}`;
+  }
+  if (path === "/orders" || path.startsWith("/orders/")) {
+    return `/m${path}`;
+  }
+  if (path === "/realname") return "/m/realname";
+  if (path === "/login") return "/m/login";
+  if (path === "/register") return "/m/register";
+  
+  if (path === "/seller/listings/create") {
+    return "/m/seller/listings/create";
+  }
+  
+  // PC-only views that don't have mobile counterparts go to mobile profile as fallback
+  if (path === "/wallet" || path === "/notifications" || path.startsWith("/seller")) {
+    return "/m/profile";
+  }
+  
   return `/m${path}`;
 }
+
+export function getPcPath(path: string): string {
+  if (!path.startsWith("/m") || path.startsWith("/admin")) {
+    return path;
+  }
+  
+  if (path === "/m" || path === "/m/") {
+    return "/";
+  }
+  
+  const subPath = path.substring(2);
+  
+  if (subPath === "/listings" || subPath.startsWith("/listings/")) {
+    return subPath;
+  }
+  if (subPath === "/orders" || subPath.startsWith("/orders/")) {
+    return subPath;
+  }
+  if (subPath === "/login") return "/login";
+  if (subPath === "/register") return "/login"; // PC uses /login for both auth actions
+  if (subPath === "/realname") return "/realname";
+  if (subPath === "/seller/listings/create") return "/seller/listings/create";
+  
+  if (subPath === "/messages") return "/";
+  if (subPath === "/profile") return "/wallet";
+  
+  return subPath || "/";
+}
+
+export function toMobilePath(path: string) {
+  return getMobilePath(path);
+}