config: _merge 递归 cast 消除 dict[Unknown,Unknown] 类型警告

config.py

@@ -12,7 +12,7 @@ import argparse
 import json
 import sys
 from pathlib import Path
-from typing import Any
+from typing import Any, cast
 
 DEFAULT_CONFIG = Path(__file__).resolve().parent / "config" / "config.json"
 
@@ -52,7 +52,10 @@ class AppConfig:
     def _merge(base: dict[str, Any], override: dict[str, Any]) -> None:
         for key, val in override.items():
             if key in base and isinstance(base[key], dict) and isinstance(val, dict):
-                AppConfig._merge(base[key], val)
+                # isinstance 收窄后是 dict[Unknown,Unknown], cast 回明确类型再递归
+                AppConfig._merge(
+                    cast(dict[str, Any], base[key]), cast(dict[str, Any], val)
+                )
             else:
                 base[key] = val