Replace 期期 equal-split with long/short bias sizing and env ratio controls.

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

lib/env/env_schema.py

@@ -91,6 +91,8 @@ HOT_RELOAD_EXACT = frozenset({
     "HEDGE_PLAN_ON_PERP_TP_CLOSE_OPTIONS",
     "HEDGE_PLAN_OO_CLOSE_WINNER_ONLY",
     "HEDGE_PLAN_OO_CLOSE_MODE_ENABLED",
+    "HEDGE_PLAN_OO_BIAS_SPLIT_BY",
+    "HEDGE_PLAN_OO_BIAS_RATIO",
     "HEDGE_PLAN_OPTIONS_MUTUAL_EXCLUSIVE",
     "HEDGE_PLAN_MANUAL_COMPLETE_ON_PARTIAL",
     "MAX_ACTIVE_HEDGE_PLANS",
@@ -121,6 +123,10 @@ SELECT_OPTIONS: dict[str, tuple[tuple[str, str], ...]] = {
         ("long_only", "仅做多"),
         ("short_only", "仅做空"),
     ),
+    "HEDGE_PLAN_OO_BIAS_SPLIT_BY": (
+        ("budget", "预算金额"),
+        ("sheets", "张数"),
+    ),
 }
 
 _SELECT_ALIASES: dict[str, dict[str, str]] = {