feat: update UI components and add new assets

- Update App, CompetitionPage, CryptoFeatureCard components with improvements
- Enhance Header and LoginPage components
- Update styling in index.css and API configurations
- Add new hand background and hand image assets
- Remove old logo.png file
- Update server configuration

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

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

web/src/components/CompetitionPage.tsx

@@ -31,6 +31,8 @@ export function CompetitionPage() {
       setIsModalOpen(true);
     } catch (error) {
       console.error('Failed to fetch trader config:', error);
+      // 对于未登录用户，不显示详细配置，这是正常行为
+      // 竞赛页面主要用于查看排行榜和基本信息
     }
   };