Cleanup: remove embedded options project and adopt src layout for FX engine

scripts/run_engine.py

@@ -3,12 +3,18 @@ from __future__ import annotations
 import json
 from datetime import datetime, timedelta, timezone
 from pathlib import Path
+import sys
+
+ROOT = Path(__file__).resolve().parents[1]
+SRC = ROOT / "src"
+if str(SRC) not in sys.path:
+    sys.path.insert(0, str(SRC))
 
 from fx_quant_engine import FXQuantEngine
 
 
 def main() -> None:
-    root = Path(__file__).resolve().parents[1]
+    root = ROOT
     engine = FXQuantEngine(config_dir=root / "config")
 
     end = datetime.now(timezone.utc)