Add SIM/LIVE switch with API keys saved to .env and OKX live executor.

Enable settings UI for mode/keys, gate strategy start when LIVE is not ready, and stop PM2 from forcing MODE=SIM.

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

backend/app/api/sim.py

@@ -6,10 +6,11 @@ from fastapi import APIRouter, Depends, HTTPException
 from pydantic import BaseModel, Field
 
 from ..config import get_settings
+from ..env_store import live_ready
+from ..live import get_executor
 from ..market import get_gateway
 from ..models.db import get_db
 from ..sim.ledger import Ledger
-from ..sim.matcher import Matcher
 from ..strategy.clock import can_open_new, window_key
 from ..strategy.group import next_group_id
 from .auth import require_user
@@ -29,7 +30,7 @@ async def sim_ledger(_user: Annotated[str, Depends(require_user)]) -> dict:
 
 @router.get("/position")
 async def sim_position(_user: Annotated[str, Depends(require_user)]) -> dict:
-    m = Matcher()
+    m = get_executor()
     return {"position": m.current_position(), "unrealized": m.unrealized()}
 
 
@@ -38,7 +39,11 @@ async def sim_open_group(
     _user: Annotated[str, Depends(require_user)],
     body: ManualOpenBody | None = None,
 ) -> dict:
-    if Matcher().has_open_position():
+    ok, reason = live_ready()
+    if not get_settings().is_sim and not ok:
+        raise HTTPException(status_code=400, detail=reason)
+    ex = get_executor()
+    if ex.has_open_position():
         raise HTTPException(status_code=409, detail="有未平仓，禁止开下一组")
     s = get_settings()
     skip_weekends = Ledger().get_setting_bool("skip_weekends", s.skip_weekends)
@@ -85,7 +90,7 @@ async def sim_open_group(
         db.fetchall("SELECT group_id FROM groups WHERE group_id LIKE ?", (f"G-{wkey}-%",))
     )
     gid = next_group_id(count)
-    r = Matcher().open_group(
+    r = ex.open_group(
         group_id=gid,
         bias=bias,
         option_side=option_side,
@@ -110,7 +115,7 @@ async def sim_open_group(
 
 @router.post("/close-group")
 async def sim_close_group(_user: Annotated[str, Depends(require_user)]) -> dict:
-    r = Matcher().close_group(reason="manual")
+    r = get_executor().close_group(reason="manual")
     if not r.ok and not r.liquidity_wait:
         raise HTTPException(status_code=400, detail=r.detail)
     return {