Show semi risk-based open size from ask and unit ratio.

Semi sizing uses market ask with semi units; Plan panel previews option/perp qty under the form.

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

backend/tests/test_risk_sizing.py

@@ -119,6 +119,41 @@ def test_selection_basis_yields_smaller_k_when_ask_cheap() -> None:
     assert r_act.k is not None and r_act.k > r_sel.k
 
 
+def test_compute_risk_sizing_unit_overrides(tmp_path, monkeypatch) -> None:
+    monkeypatch.setenv("MODE", "SIM")
+    from app.models.db import Database
+    from app.strategy.risk_sizing import compute_risk_sizing
+
+    db = Database(tmp_path / "risk_units.db")
+    db.set_setting("sizing_mode", "risk_based")
+    db.set_setting("risk_loss_mode", "absolute")
+    db.set_setting("risk_loss_usdt", "83")
+    db.set_setting("fee_rate", "0.0005")
+    db.set_setting("risk_leverage_basis", "selection")
+    db.set_setting("min_option_leverage", "100")
+    db.set_setting("risk_perp_unit", "1")
+    db.set_setting("risk_option_unit", "2")
+    db.set_setting("risk_exit_unit", "15")
+
+    # 覆盖为单位 0.5:4、出场 5，并强制实际卖一（ask=20 → cost=80+3=83 → k=1）
+    r = compute_risk_sizing(
+        index_px=2000.0,
+        option_ask=20.0,
+        db=db,
+        perp_unit=0.5,
+        option_unit=4.0,
+        exit_unit=5.0,
+        leverage_basis="actual",
+    )
+    assert r.ok
+    assert r.leverage_basis == "actual"
+    assert r.k == 1.0
+    assert r.perp_qty_eth == 0.5
+    assert r.option_qty_eth == 4.0
+    assert r.net_profit_target == 5.0
+    db.close()
+
+
 def test_compute_risk_sizing_respects_basis(tmp_path, monkeypatch) -> None:
     monkeypatch.setenv("MODE", "SIM")
     from app.models.db import Database