feat(website): SEO 升级 — BrowserRouter + 每页独立 meta

- HashRouter → BrowserRouter（basename /KimiSwitch），GitHub Pages 用 404.html SPA 回退，/features /download /changelog 变为可收录的独立 URL
- 每页独立 title / description / OG / canonical（RouteMeta 随语言切换）
- og:image 改为绝对地址；sitemap 更新为干净路径

website/src/App.tsx

@@ -8,6 +8,10 @@ import Download from "./sections/Download";
 import Privacy from "./sections/Privacy";
 import CTA from "./sections/CTA";
 import Footer from "./components/Footer";
+import { useLang, type Dict } from "./i18n";
+
+const SITE_URL = "https://billowliu2.github.io/KimiSwitch";
+type SeoKey = keyof Dict["seo"];
 
 function ScrollToTop() {
   const { pathname } = useLocation();
@@ -17,6 +21,47 @@ function ScrollToTop() {
   return null;
 }
 
+/** Update per-page title / description / OG / canonical for SEO. */
+function RouteMeta() {
+  const { pathname } = useLocation();
+  const { t } = useLang();
+
+  useEffect(() => {
+    const page = pathname.replace(/\/+$/, "");
+    const seoKey: SeoKey =
+      page === "/features" || page === "/changelog" || page === "/download"
+        ? (page.slice(1) as SeoKey)
+        : "home";
+    const m = t.seo[seoKey];
+    const url = `${SITE_URL}${page === "" ? "/" : page}`;
+
+    document.title = m.title;
+    setMeta("name", "description", m.description);
+    setMeta("property", "og:title", m.title);
+    setMeta("property", "og:description", m.description);
+    setMeta("property", "og:url", url);
+    setMeta("name", "twitter:title", m.title);
+    setMeta("name", "twitter:description", m.description);
+
+    const canon = document.querySelector('link[rel="canonical"]');
+    if (canon) canon.setAttribute("href", url);
+  }, [pathname, t]);
+
+  return null;
+}
+
+function setMeta(attr: "name" | "property", key: string, content: string) {
+  let el = document.head.querySelector<HTMLMetaElement>(
+    `meta[${attr}="${key}"]`,
+  );
+  if (!el) {
+    el = document.createElement("meta");
+    el.setAttribute(attr, key);
+    document.head.appendChild(el);
+  }
+  el.setAttribute("content", content);
+}
+
 const homePage = (
   <>
     <Hero />
@@ -30,6 +75,7 @@ export default function App() {
       <Nav />
       <main className="flex-1">
         <ScrollToTop />
+        <RouteMeta />
         <Routes>
           <Route path="/" element={homePage} />
           <Route

website/src/i18n.tsx

@@ -252,6 +252,28 @@ const zh = {
     download: "免费下载",
     source: "GitHub 源码",
   },
+  seo: {
+    home: {
+      title: "Kimi Switch — 多 LLM 供应商统一管理 · 用量监控 · 账单一目了然",
+      description:
+        "Kimi Switch / KimiCodeSwitch — Windows 桌面端多 LLM 供应商统一管理器，一键切换 Kimi / 智谱 GLM / MiniMax / DeepSeek / OpenRouter / 基元律动，用量账单实时监控，开源 MIT。",
+    },
+    features: {
+      title: "核心功能 - Kimi Switch",
+      description:
+        "Kimi Switch 核心功能：多供应商管理、用量与账单监控、Kimi 一键授权登录、智能模型发现与自动更新，22 个预设开箱即用。",
+    },
+    changelog: {
+      title: "更新日志 - Kimi Switch",
+      description:
+        "Kimi Switch 更新日志：每个版本的重要变更记录，同步自 GitHub Releases。",
+    },
+    download: {
+      title: "下载 - Kimi Switch",
+      description:
+        "下载 Kimi Switch：Windows .msi、macOS .dmg、Linux .deb / .AppImage / .rpm，免费开源 MIT。",
+    },
+  },
   footer: {
     recommend: "推荐供应商",
     mirror: "国内镜像",
@@ -516,6 +538,28 @@ const en: Dict = {
     download: "Free Download",
     source: "GitHub Source",
   },
+  seo: {
+    home: {
+      title: "Kimi Switch — Unified Management for AI Providers · Usage & Billing",
+      description:
+        "Kimi Switch / KimiCodeSwitch — a Windows desktop manager for multiple LLM providers. Switch between Kimi, Zhipu GLM, MiniMax, DeepSeek, OpenRouter and TokenRhythm in one click, with usage and billing at a glance. Open source MIT.",
+    },
+    features: {
+      title: "Core Features - Kimi Switch",
+      description:
+        "Kimi Switch core features: multi-provider management, usage & billing, one-click Kimi login, smart model discovery and auto updates. 22 presets out of the box.",
+    },
+    changelog: {
+      title: "Changelog - Kimi Switch",
+      description:
+        "Kimi Switch changelog: notable changes in every release, synced from GitHub Releases.",
+    },
+    download: {
+      title: "Download - Kimi Switch",
+      description:
+        "Download Kimi Switch: Windows .msi, macOS .dmg, Linux .deb / .AppImage / .rpm. Free and open source under MIT.",
+    },
+  },
   footer: {
     recommend: "Recommended Providers",
     mirror: "China mirror",

website/src/main.tsx

@@ -1,16 +1,16 @@
 import { StrictMode } from "react";
 import { createRoot } from "react-dom/client";
-import { HashRouter } from "react-router-dom";
+import { BrowserRouter } from "react-router-dom";
 import { LangProvider } from "./i18n";
 import App from "./App";
 import "./index.css";
 
 createRoot(document.getElementById("root")!).render(
   <StrictMode>
-    <HashRouter>
+    <BrowserRouter basename="/KimiSwitch">
       <LangProvider>
         <App />
       </LangProvider>
-    </HashRouter>
+    </BrowserRouter>
   </StrictMode>,
 );