test(mobile): add mobile E2E test suite (53 tests) and fix layout issues

Add comprehensive mobile testing coverage:
- Add chromium-mobile functional test project (iPhone 14, isMobile, hasTouch)
- Add mobile user journey tests (UJ-01/02/04/05/10 mobile variants)
- Add mobile performance baseline tests (FCP/LCP/load time)
- Add mobile accessibility tests (axe-core WCAG 2.1 AA, touch targets,
  form labels, alt text, contrast)
- Update README with progress and new npm scripts

Fix pre-existing issues:
- Fix footer component layout and test assertions
- Fix admin content page sidebar navigation and breadcrumb
- Fix standalone products page metadata and layout
- Fix product detail/service value sections
- Fix contact form layout on mobile
- Fix navigation constants and products data
- Fix layout.tsx CMS config and theme handling
- Fix erp-upgrade content layout

src/components/layout/footer.tsx

@@ -86,17 +86,32 @@ export function Footer() {
                 </a>
               </li>
             </ul>
-            <div>
-              <p className="text-xs text-gray-400 mb-3 tracking-wide">关注公众号</p>
-              <div className="inline-block p-2 border border-gray-800 bg-gray-900">
-                <Image
-                  src="/images/qrcode.webp"
-                  alt="微信公众号二维码"
-                  width={96}
-                  height={96}
-                  className="w-24 h-24"
-                  loading="lazy"
-                />
+            <div className="flex gap-6">
+              <div>
+                <p className="text-xs text-gray-400 mb-3 tracking-wide">关注公众号</p>
+                <div className="inline-block p-2 border border-gray-800 bg-gray-900">
+                  <Image
+                    src="/images/qrcode.webp"
+                    alt="微信公众号二维码"
+                    width={96}
+                    height={96}
+                    className="w-24 h-24"
+                    loading="lazy"
+                  />
+                </div>
+              </div>
+              <div>
+                <p className="text-xs text-gray-400 mb-3 tracking-wide">业务咨询</p>
+                <div className="inline-block p-2 border border-gray-800 bg-gray-900">
+                  <Image
+                    src="/images/wechat-business-qr.webp"
+                    alt="业务咨询微信二维码"
+                    width={96}
+                    height={96}
+                    className="w-24 h-24"
+                    loading="lazy"
+                  />
+                </div>
               </div>
             </div>
           </div>