Show bid/ask liquidity as price per sheet in options chain.

Display OKX askSz and bidSz beside top-of-book prices in the chain table and order panel using price/sheets format.

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

tests/test_options_pricing.py

@@ -67,6 +67,15 @@ def test_option_moneyness():
     assert option_moneyness_label("otm") == "虚值"
 
 
+def test_format_quote_liquidity():
+    from lib.options.options_pricing_lib import format_quote_liquidity
+
+    assert format_quote_liquidity(17.2, 150) == "17.2/150"
+    assert format_quote_liquidity(817.6, 11) == "817.6/11"
+    assert format_quote_liquidity(15.6, None) == "15.6"
+    assert format_quote_liquidity(None, 10) is None
+
+
 def test_expiry_breakeven_from_ask():
     from lib.options.options_pricing_lib import expiry_breakeven_from_ask