Initial commit: Polymarket copy trading bot

- Backend: Spring Boot + Kotlin implementation
  - Account management with private key import
  - Leader management
  - Copy trading configuration
  - Order synchronization
  - Balance and position queries via Polymarket API
  - Ethereum RPC integration for USDC balance
  - Proxy address calculation

- Frontend: React + TypeScript
  - Account management UI
  - Mobile responsive design
  - Account import with private key/mnemonic support
  - Balance display and account details modal

- Database: MySQL with Flyway migrations
- API Integration: Polymarket CLOB API, Data API, Ethereum RPC

frontend/src/styles/index.css

@@ -0,0 +1,32 @@
+* {
+  margin: 0;
+  padding: 0;
+  box-sizing: border-box;
+}
+
+body {
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
+    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
+    sans-serif;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+#root {
+  min-height: 100vh;
+}
+
+/* 移动端适配 */
+@media (max-width: 768px) {
+  body {
+    font-size: 14px;
+  }
+}
+
+/* 桌面端适配 */
+@media (min-width: 769px) {
+  body {
+    font-size: 16px;
+  }
+}
+