Support LIVE exchange funds and perp margin mode.

Hide sim equity when LIVE is selected; OKX funds bar uses exchange balances; add cross/isolated for perp only (options stay cash).

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

backend/app/api/settings.py

@@ -37,6 +37,7 @@ KEYS = (
     "skip_weekends",
     "initial_equity",
     "leverage",
+    "perp_margin_mode",
     "min_option_hours",
     "min_option_leverage",
     "atm_open_offset_enabled",
@@ -61,6 +62,7 @@ class StrategySettingsBody(BaseModel):
     skip_weekends: bool | None = None
     initial_equity: float | None = Field(default=None, ge=1000, le=10_000_000)
     leverage: float | None = Field(default=None, ge=1, le=125)
+    perp_margin_mode: str | None = Field(default=None, pattern="^(cross|isolated)$")
     min_option_hours: float | None = Field(default=None, ge=1, le=720)
     min_option_leverage: float | None = Field(default=None, ge=1, le=10000)
     atm_open_offset_enabled: bool | None = None
@@ -117,6 +119,20 @@ def _read_settings() -> dict:
             db.get_setting("initial_equity", str(s.initial_equity)) or s.initial_equity
         ),
         "leverage": float(db.get_setting("leverage", str(s.leverage)) or s.leverage),
+        "perp_margin_mode": (
+            mm
+            if (
+                mm := str(
+                    db.get_setting("perp_margin_mode", s.perp_margin_mode)
+                    or s.perp_margin_mode
+                    or "cross"
+                )
+                .strip()
+                .lower()
+            )
+            in ("cross", "isolated")
+            else "cross"
+        ),
         "min_option_hours": float(
             db.get_setting("min_option_hours", str(s.min_option_hours))
             or s.min_option_hours