fix: kline time display in Beijing time (UTC+8)

frontend/app/kline/page.tsx

@@ -39,10 +39,28 @@ function chartOptions(height: number) {
       horzLines: { color: "#f1f5f9" },
     },
     crosshair: { mode: 1 },
+    localization: {
+      timeFormatter: (ts: number) => {
+        // UTC+8 北京时间
+        const d = new Date((ts + 8 * 3600) * 1000);
+        const Y = d.getUTCFullYear();
+        const M = String(d.getUTCMonth() + 1).padStart(2, "0");
+        const D = String(d.getUTCDate()).padStart(2, "0");
+        const h = String(d.getUTCHours()).padStart(2, "0");
+        const m = String(d.getUTCMinutes()).padStart(2, "0");
+        return `${Y}-${M}-${D} ${h}:${m}`;
+      },
+    },
     timeScale: {
       borderColor: "#e2e8f0",
       timeVisible: true,
       secondsVisible: false,
+      tickMarkFormatter: (ts: number) => {
+        const d = new Date((ts + 8 * 3600) * 1000);
+        const h = String(d.getUTCHours()).padStart(2, "0");
+        const m = String(d.getUTCMinutes()).padStart(2, "0");
+        return `${h}:${m}`;
+      },
     },
     rightPriceScale: { borderColor: "#e2e8f0" },
     height,