refactor(common): simplify language switch logic to redirect to home page for selected language

public/themes/dist_static/static/js/common.js

@@ -175,7 +175,7 @@ $(function() {
 		$subgroup.find(".nav-mega__subgroup-toggle").attr("aria-expanded", isExpanded);
 	});
 
-	// 语言切换：默认语言无前缀，其它语言用 /{lang}/ 前缀（与 getLang 一致）
+	// 语言切换：始终跳到对应语言首页（避免详情页等带 id 的 URL 直接换前缀后报错）
 	(function initLangSwitch() {
 		const ALLOWED = ["zh", "tc", "en", "ja", "de", "fa", "id", "th", "ru"];
 		const defaultLang =
@@ -186,17 +186,9 @@ $(function() {
 			return ALLOWED.includes(seg) ? seg : defaultLang;
 		};
 
-		const buildLangUrl = (targetLang) => {
-			const parts = location.pathname.replace(/^\//, "").split("/").filter(Boolean);
-			if (parts.length && ALLOWED.includes(parts[0])) parts.shift();
-			const rest = parts.join("/");
-			let path;
-			if (!targetLang || targetLang === defaultLang) {
-				path = rest ? `/${rest}` : "/";
-			} else {
-				path = rest ? `/${targetLang}/${rest}` : `/${targetLang}`;
-			}
-			return path + location.search + location.hash;
+		const buildLangHomeUrl = (targetLang) => {
+			if (!targetLang || targetLang === defaultLang) return "/";
+			return `/${targetLang}`;
 		};
 
 		const goLang = (targetLang) => {
@@ -204,7 +196,7 @@ $(function() {
 			const cur = getPathLang();
 			const uiCur = cur === "en" ? "en" : "zh";
 			if (targetLang === uiCur || targetLang === cur) return;
-			location.href = buildLangUrl(targetLang);
+			location.href = buildLangHomeUrl(targetLang);
 		};
 
 		const syncActive = () => {