行情区：K线全屏、可选技术指标与交易所价格精度对齐

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

hub_kline_store.py

@@ -276,6 +276,19 @@ def resolve_chart_bars(
     if len(db_rows) > need:
         db_rows = db_rows[-need:]
 
+    if price_tick is None:
+        try:
+            tick_probe = remote_fetch(
+                symbol=sym,
+                timeframe=tf,
+                since_ms=None,
+                limit=3,
+            )
+            if tick_probe.get("ok"):
+                price_tick = tick_probe.get("price_tick")
+        except Exception:
+            pass
+
     candles = _to_chart_candles(db_rows)
     if not candles:
         return {"ok": False, "msg": remote_err or "无 K 线数据", "purged": purged}