feat: 添加 PWA 支持

index.html

@@ -1,10 +1,26 @@
 <!doctype html>
-<html lang="en">
+<html lang="zh-CN">
   <head>
     <meta charset="UTF-8" />
-    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>vite-app</title>
+    <meta
+      name="description"
+      content="一个本地优先的 OpenAI-compatible LLM 聊天面板。"
+    />
+    <meta name="theme-color" content="#111111" />
+    <meta name="mobile-web-app-capable" content="yes" />
+    <meta name="apple-mobile-web-app-capable" content="yes" />
+    <meta name="apple-mobile-web-app-title" content="LLM Chat" />
+    <meta name="apple-mobile-web-app-status-bar-style" content="default" />
+    <link rel="manifest" href="/manifest.webmanifest" />
+    <link
+      rel="icon"
+      type="image/png"
+      sizes="192x192"
+      href="/icons/icon-192.png"
+    />
+    <link rel="apple-touch-icon" href="/icons/apple-touch-icon.png" />
+    <title>Simple LLM Chat UI</title>
   </head>
   <body>
     <div id="root"></div>