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

package.json

@@ -0,0 +1,25 @@
+{
+  "name": "mini-swap-dex",
+  "version": "1.0.0",
+  "description": "一个简单的去中心化交易所 AMM 模型",
+  "main": "index.js",
+  "scripts": {
+    "test": "hardhat test",
+    "compile": "hardhat compile",
+    "deploy": "hardhat run scripts/deploy.js --network localhost",
+    "node": "hardhat node",
+    "dev": "cd frontend && npm start",
+    "build": "cd frontend && npm run build"
+  },
+  "keywords": ["defi", "dex", "amm", "ethereum", "solidity", "react"],
+  "author": "",
+  "license": "MIT",
+  "devDependencies": {
+    "@nomicfoundation/hardhat-toolbox": "^4.0.0",
+    "hardhat": "^2.19.0"
+  },
+  "dependencies": {
+    "@openzeppelin/contracts": "^5.0.0",
+    "dotenv": "^16.3.1"
+  }
+}