feat: 完成 Mini Swap DEX AMM 项目开发

- 添加智能合约: TokenA, TokenB, MiniSwapAMM
- 实现 AMM 流动性池功能 (x * y = k 公式)
- 支持添加/移除流动性和代币交换
- 包含完整的测试套件
- 创建 React 前端界面，支持钱包连接
- 添加 Web3 集成和现代化 UI 设计
- 包含部署脚本和完整的项目配置

frontend/public/manifest.json

@@ -0,0 +1,25 @@
+{
+  "short_name": "React App",
+  "name": "Create React App Sample",
+  "icons": [
+    {
+      "src": "favicon.ico",
+      "sizes": "64x64 32x32 24x24 16x16",
+      "type": "image/x-icon"
+    },
+    {
+      "src": "logo192.png",
+      "type": "image/png",
+      "sizes": "192x192"
+    },
+    {
+      "src": "logo512.png",
+      "type": "image/png",
+      "sizes": "512x512"
+    }
+  ],
+  "start_url": ".",
+  "display": "standalone",
+  "theme_color": "#000000",
+  "background_color": "#ffffff"
+}