Show residual bid as price/size and recovery percent from bid premium.

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

backend/tests/test_residual_premium_close.py

@@ -206,7 +206,11 @@ def test_manual_close_skips_premium_ratio(tmp_path, monkeypatch) -> None:
     enriched = m.list_residual_options_enriched()
     assert len(enriched) == 1
     assert enriched[0]["liquidity_ok"] is True
-    assert enriched[0]["recovery_pct"] is not None
+    assert enriched[0]["bid_px"] == 5.0
+    assert enriched[0]["bid_sz"] == 10_000.0
+    assert abs(float(enriched[0]["bid_sz_eth"]) - 100.0) < 1e-9  # 10000*0.01
+    assert abs(float(enriched[0]["current_premium"]) - 10.0) < 1e-9  # 5*2
+    assert abs(float(enriched[0]["recovery_pct"]) - 10.0) < 1e-9  # 10/100*100
     assert float(enriched[0]["recovery_pct"]) < 20.0
 
     r = m.close_residual_manual("G-res")