Try all OTM strikes in offset when nearest fails leverage.

Closest Call@1920 at 152x no longer blocks 1930/1940 that already clear 200x.

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

backend/tests/test_semi_auto.py

@@ -2,7 +2,7 @@
 
 from __future__ import annotations
 
-from app.strategy.selection import pick_otm_strike
+from app.strategy.selection import list_otm_strikes, pick_otm_strike
 from app.strategy.semi_auto import (
     REASON_PERP_NET,
     REASON_POINTS,
@@ -98,3 +98,10 @@ def test_pick_otm_within_offset() -> None:
     # Put 虚值
     k2 = pick_otm_strike(strikes, 1830, option_side="put", max_offset=30)
     assert k2 == 1825.0
+
+
+def test_list_otm_strikes_near_to_far() -> None:
+    # 现价 1917 → Call 虚值 1920/1930/1940（偏离≤25），近→远
+    strikes = [1910.0, 1920.0, 1930.0, 1940.0, 1950.0]
+    ks = list_otm_strikes(strikes, 1917.0, option_side="call", max_offset=25)
+    assert ks == [1920.0, 1930.0, 1940.0]