Treat option-option amplitude as a maximum cap.

Reject opens when range exceeds the setting; update UI and docs labels.

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

backend/app/strategy/oo_selection.py

@@ -118,7 +118,7 @@ def build_oo_pick_core(
     amp = amplitude or fetch_amplitude_hl_for_runtime(amplitude_hours)
     if amp is None:
         return None
-    if float(amp.range_pct) + 1e-12 < float(amplitude_pct):
+    if float(amp.range_pct) > float(amplitude_pct) + 1e-12:
         return None
     if spot <= 0:
         spot = float(amp.mid)