feat(crypto-tail): 尾盘策略页币安 API 状态监控与重连间隔调整

- 尾盘策略页：进入时检测币安 API/WebSocket，异常时红色强提醒
- 异常时提供「重新检测」按钮，不跳转 API 健康页、不做 60s 轮询
- 文案面向小白：无法连接币安 API、需行情数据、稍后重新检测
- 多语言：zh-CN/zh-TW/en 新增 cryptoTailStrategy.binanceApiAlert
- 币安 K 线 WS 重连延迟由 10s 改为 3s

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/src/main/kotlin/com/wrbug/polymarketbot/service/binance/BinanceKlineService.kt

@@ -130,7 +130,7 @@ class BinanceKlineService {
     private fun scheduleReconnect() {
         if (reconnectJob?.isActive == true) return
         reconnectJob = scope.launch {
-            delay(10_000)
+            delay(3_000)
             reconnectJob = null
             ws5m?.close(1000, "reconnect")
             ws15m?.close(1000, "reconnect")