fix: import _safe_float at module level for options close route

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

lib/options/options_register.py

@@ -17,6 +17,7 @@ from lib.options.options_pricing_lib import (
     premium_per_sheet,
     total_premium,
 )
+from lib.exchange.okx_options_lib import _pos_side_from_position, _safe_float
 
 
 def _env_bool(key: str, default: bool = False) -> bool:
@@ -59,8 +60,6 @@ def install_options_trading(app: Flask, repo_root: str, app_module: Any) -> None
 
 def _build_cfg(app_module: Any) -> dict[str, Any]:
     from lib.exchange.okx_options_lib import (
-        _pos_side_from_position,
-        _safe_float,
         build_option_chain,
         estimate_usdt_to_usdc,
         execute_convert,