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/hooks/useCounterAnimation.ts

@@ -0,0 +1,51 @@
+import { useEffect, useState } from 'react'
+
+interface UseCounterAnimationOptions {
+  start?: number
+  end: number
+  duration?: number
+  decimals?: number
+}
+
+export function useCounterAnimation({
+  start = 0,
+  end,
+  duration = 2000,
+  decimals = 0,
+}: UseCounterAnimationOptions): number {
+  const [count, setCount] = useState(start)
+
+  useEffect(() => {
+    if (end === 0) return
+
+    let startTime: number | null = null
+    let animationFrame: number
+
+    const animate = (currentTime: number) => {
+      if (startTime === null) startTime = currentTime
+      const progress = Math.min((currentTime - startTime) / duration, 1)
+
+      // 使用 easeOutExpo 缓动函数，让数字快速启动后缓慢停止
+      const easeOutExpo = progress === 1 ? 1 : 1 - Math.pow(2, -10 * progress)
+
+      const currentCount = start + (end - start) * easeOutExpo
+      setCount(currentCount)
+
+      if (progress < 1) {
+        animationFrame = requestAnimationFrame(animate)
+      } else {
+        setCount(end)
+      }
+    }
+
+    animationFrame = requestAnimationFrame(animate)
+
+    return () => {
+      if (animationFrame) {
+        cancelAnimationFrame(animationFrame)
+      }
+    }
+  }, [start, end, duration])
+
+  return decimals > 0 ? parseFloat(count.toFixed(decimals)) : Math.floor(count)
+}