feat: implement hybrid database architecture and frontend encryption

- Add PostgreSQL + SQLite hybrid database support with automatic switching
- Implement frontend AES-GCM + RSA-OAEP encryption for sensitive data
- Add comprehensive DatabaseInterface with all required methods
- Fix compilation issues with interface consistency
- Update all database method signatures to use DatabaseInterface
- Add missing UpdateTraderInitialBalance method to PostgreSQL implementation
- Integrate RSA public key distribution via /api/config endpoint
- Add frontend crypto service with proper error handling
- Support graceful degradation between encrypted and plaintext transmission
- Add directory creation for RSA keys and PEM parsing fixes
- Test both SQLite and PostgreSQL modes successfully

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

Co-Authored-By: tinkle-community <tinklefund@gmail.com>

web/src/utils/traderColors.ts

@@ -12,7 +12,7 @@ export const TRADER_COLORS = [
   '#a78bfa', // violet-400
   '#4ade80', // green-400
   '#fb7185', // rose-400
-];
+]
 
 /**
  * 根据trader的索引位置获取颜色
@@ -24,8 +24,8 @@ export function getTraderColor(
   traders: Array<{ trader_id: string }>,
   traderId: string
 ): string {
-  const traderIndex = traders.findIndex((t) => t.trader_id === traderId);
-  if (traderIndex === -1) return TRADER_COLORS[0]; // 默认返回第一个颜色
+  const traderIndex = traders.findIndex((t) => t.trader_id === traderId)
+  if (traderIndex === -1) return TRADER_COLORS[0] // 默认返回第一个颜色
   // 如果超出颜色池大小，循环使用
-  return TRADER_COLORS[traderIndex % TRADER_COLORS.length];
+  return TRADER_COLORS[traderIndex % TRADER_COLORS.length]
 }