feat: 添加 YT Asset 合约测试前端

- React + TypeScript + Vite 项目结构
- WalletConnect 钱包连接功能
- WUSD 铸造页面（含边界测试）
- Vault 交易页面（买入/卖出 YT，含边界测试）
- Factory 管理页面（创建 Vault、更新价格，含权限测试）
- 中英文国际化支持
- 显示 Owner/Manager 角色信息

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/i18n/locales/en.json

@@ -0,0 +1,135 @@
+{
+  "common": {
+    "connectWallet": "Connect Wallet",
+    "disconnect": "Disconnect",
+    "processing": "Processing...",
+    "confirm": "Confirm",
+    "cancel": "Cancel",
+    "loading": "Loading...",
+    "success": "Success!",
+    "error": "Error",
+    "balance": "Balance",
+    "amount": "Amount",
+    "contract": "Contract",
+    "address": "Address",
+    "network": "Arbitrum Sepolia",
+    "connectFirst": "Please connect wallet first"
+  },
+  "nav": {
+    "wusd": "WUSD",
+    "vaultTrading": "Vault Trading",
+    "factory": "Factory"
+  },
+  "header": {
+    "title": "YT Asset Test"
+  },
+  "footer": {
+    "description": "YT Asset Contract Testing Interface"
+  },
+  "wusd": {
+    "title": "WUSD Token",
+    "mintAmount": "Mint Amount",
+    "enterAmount": "Enter amount to mint",
+    "mint": "Mint WUSD",
+    "minting": "Minting...",
+    "confirming": "Confirming...",
+    "mintSuccess": "Mint successful!"
+  },
+  "vault": {
+    "title": "Vault Trading",
+    "selectVault": "Select Vault",
+    "vaultInfo": "Vault Info",
+    "totalAssets": "Total Assets",
+    "idleAssets": "Idle Assets",
+    "totalSupply": "Total Supply",
+    "hardCap": "Hard Cap",
+    "wusdPrice": "WUSD Price",
+    "ytPrice": "YT Price",
+    "yourWusdBalance": "Your WUSD Balance",
+    "yourYtBalance": "Your YT Balance",
+    "buyYt": "Buy YT",
+    "sellYt": "Sell YT",
+    "wusdAmount": "WUSD Amount",
+    "ytAmount": "YT Amount",
+    "enterWusdAmount": "Enter WUSD amount",
+    "enterYtAmount": "Enter YT amount",
+    "youWillReceive": "You will receive",
+    "approveWusd": "Approve WUSD",
+    "buy": "Buy YT",
+    "sell": "Sell YT"
+  },
+  "factory": {
+    "title": "Factory Management",
+    "factoryContract": "Factory Contract",
+    "owner": "Owner",
+    "defaultHardCap": "Default Hard Cap",
+    "totalVaults": "Total Vaults",
+    "yourRole": "Your Role",
+    "roleOwner": "Owner",
+    "roleUser": "User",
+    "allVaults": "All Vaults",
+    "noVaults": "No vaults created yet",
+    "createVault": "Create New Vault",
+    "name": "Name",
+    "symbol": "Symbol",
+    "managerAddress": "Manager Address",
+    "redemptionTime": "Redemption Time",
+    "initialWusdPrice": "Initial WUSD Price",
+    "initialYtPrice": "Initial YT Price",
+    "create": "Create Vault",
+    "updatePrices": "Update Vault Prices",
+    "vaultAddress": "Vault Address",
+    "selectVault": "Select Vault",
+    "newWusdPrice": "New WUSD Price",
+    "newYtPrice": "New YT Price",
+    "update": "Update Prices"
+  },
+  "language": {
+    "en": "English",
+    "zh": "Chinese"
+  },
+  "test": {
+    "title": "Boundary Test",
+    "currentStatus": "Current Status",
+    "canRedeem": "Can Redeem",
+    "timeToRedeem": "Time to Redeem",
+    "hardCap": "Hard Cap",
+    "role": "Your Role",
+    "yes": "Yes",
+    "no": "No",
+    "customAmount": "Custom Amount",
+    "transferAddress": "Transfer Address",
+    "boundaryTests": "Boundary Tests",
+    "boundaryHint": "These tests are designed to trigger contract errors. Expected errors are shown for each test.",
+    "permissionTests": "Permission Tests",
+    "permissionHint": "Test permission restrictions. Should fail if you're not Owner/Manager.",
+    "managerTests": "Manager Functions",
+    "managerHint": "Manager-only functions. Current Manager: ",
+    "normalTests": "Normal Functions",
+    "quickActions": "Quick Actions",
+    "run": "Run",
+    "running": "Running...",
+    "mint10000": "Mint 10000 WUSD",
+    "maxApprove": "Max Approve WUSD",
+    "buyZero": "Buy Amount 0",
+    "buyZeroDesc": "Test depositYT(0)",
+    "sellZero": "Sell Amount 0",
+    "sellZeroDesc": "Test withdrawYT(0)",
+    "buyExceedBalance": "Buy Exceed Balance",
+    "buyExceedBalanceDesc": "Buy more than WUSD balance",
+    "sellExceedBalance": "Sell Exceed Balance",
+    "sellExceedBalanceDesc": "Sell more than YT balance",
+    "buyExceedHardcap": "Buy Exceed Hardcap",
+    "buyExceedHardcapDesc": "Buy amount exceeds vault hardcap",
+    "sellInLock": "Sell In Lock Period",
+    "sellInLockDesc": "Try to sell during lock period",
+    "mintZero": "Mint Amount 0",
+    "mintZeroDesc": "Test mint(0)",
+    "burnExceed": "Burn Exceed Balance",
+    "burnExceedDesc": "Burn more than balance",
+    "updatePriceNotOwner": "Update Price (Not Owner)",
+    "updatePriceNotOwnerDesc": "Non-owner calls updateVaultPrices",
+    "setManagerNotOwner": "Set Manager (Not Owner)",
+    "setManagerNotOwnerDesc": "Non-owner calls setVaultManager"
+  }
+}