feat: 添加 PWA 支持和 SEO 优化

添加 PWA manifest 文件、favicon、结构化数据、sitemap 和 robots.txt。
优化根布局和组件的国际化支持，包括服务端语言检测和防止水合闪烁。

public/favicon.ico

@@ -0,0 +1 @@
+data:image/x-icon;base64,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

public/icon.svg

@@ -0,0 +1,12 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 128 128" fill="none">
+  <rect width="128" height="128" rx="28" fill="#3b82f6"/>
+  <rect x="16" y="16" width="40" height="40" rx="8" fill="white" opacity="0.9"/>
+  <rect x="72" y="16" width="40" height="40" rx="8" fill="white" opacity="0.7"/>
+  <rect x="16" y="72" width="40" height="40" rx="8" fill="white" opacity="0.7"/>
+  <rect x="72" y="72" width="40" height="40" rx="8" fill="white" opacity="0.5"/>
+  <path d="M30 32 L42 32 L42 42 L30 42 Z" fill="#3b82f6"/>
+  <circle cx="92" cy="36" r="6" fill="#3b82f6"/>
+  <rect x="32" y="82" width="16" height="16" rx="4" fill="#3b82f6"/>
+  <path d="M85 78 L99 78 L99 86 L85 86 Z" fill="#3b82f6"/>
+  <path d="M85 90 L99 90 L99 98 L85 98 Z" fill="#3b82f6"/>
+</svg>

public/manifest.json

@@ -0,0 +1,75 @@
+{
+  "name": "Mini Game AI - AI-Powered Tools for Game Developers",
+  "short_name": "Mini Game AI",
+  "description": "Transform your game development workflow with AI-powered tools. Video to frames, image compression, audio processing, texture atlas generation, and more.",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#09090b",
+  "theme_color": "#3b82f6",
+  "orientation": "portrait-primary",
+  "icons": [
+    {
+      "src": "/icon-72x72.png",
+      "sizes": "72x72",
+      "type": "image/png",
+      "purpose": "maskable any"
+    },
+    {
+      "src": "/icon-96x96.png",
+      "sizes": "96x96",
+      "type": "image/png",
+      "purpose": "maskable any"
+    },
+    {
+      "src": "/icon-128x128.png",
+      "sizes": "128x128",
+      "type": "image/png",
+      "purpose": "maskable any"
+    },
+    {
+      "src": "/icon-144x144.png",
+      "sizes": "144x144",
+      "type": "image/png",
+      "purpose": "maskable any"
+    },
+    {
+      "src": "/icon-152x152.png",
+      "sizes": "152x152",
+      "type": "image/png",
+      "purpose": "maskable any"
+    },
+    {
+      "src": "/icon-192x192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "maskable any"
+    },
+    {
+      "src": "/icon-384x384.png",
+      "sizes": "384x384",
+      "type": "image/png",
+      "purpose": "maskable any"
+    },
+    {
+      "src": "/icon-512x512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "maskable any"
+    }
+  ],
+  "categories": ["productivity", "utilities", "developer"],
+  "screenshots": [
+    {
+      "src": "/screenshot-desktop.png",
+      "sizes": "1280x720",
+      "type": "image/png",
+      "form_factor": "wide"
+    },
+    {
+      "src": "/screenshot-mobile.png",
+      "sizes": "750x1334",
+      "type": "image/png",
+      "form_factor": "narrow"
+    }
+  ]
+}