fix(hub): 修复行情区 K 线 Gate 分页与图表 unexpected base

Gate OHLCV 分页在接近当前时间时停止并容错 from>to；分页失败时用 limit 兜底。chart.js 为 priceFormat 增加整数 base，setData 失败时回退默认精度。

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

tests/test_hub_ohlcv_lib.py

@@ -163,6 +163,34 @@ class TestHubOhlcvLib(unittest.TestCase):
         self.assertTrue(bars_spacing_matches_timeframe(bars, "12h"))
         self.assertEqual(ex.calls[0]["timeframe"], "1h")
 
+    def test_pagination_stops_when_next_since_reaches_now(self):
+        """Gate 等：分页 since 不得越过当前时间，避免 from>to。"""
+        from hub_ohlcv_lib import TIMEFRAME_MS
+
+        step = TIMEFRAME_MS["1d"]
+        now_ms = int(__import__("time").time() * 1000)
+        # 最后一页最后一根 K 的 next_since 将 >= now_ms，应停止不再请求
+        last_open = ((now_ms // step) - 2) * step
+        page = [
+            [last_open - step, 1.0, 1.1, 0.9, 1.0, 10.0],
+            [last_open, 1.1, 1.2, 1.0, 1.1, 11.0],
+        ]
+        ex = _FakeExchange([page])
+
+        out = fetch_ohlcv_for_hub(
+            symbol="ONDO/USDT",
+            timeframe="1d",
+            since_ms=last_open - step * 5,
+            limit=10,
+            normalize_symbol_input=lambda s: str(s).strip().upper(),
+            normalize_exchange_symbol=lambda s: f"{s}:USDT" if ":" not in s else s,
+            ensure_markets_loaded=lambda: None,
+            exchange=ex,
+        )
+        self.assertTrue(out.get("ok"))
+        self.assertGreaterEqual(len(out.get("bars") or []), 2)
+        self.assertLessEqual(len(ex.calls), 4)
+
     def test_aggregate_ohlcv_bars_buckets(self):
         from hub_ohlcv_lib import TIMEFRAME_MS