fix: align resource and runtime paths

src/services/config_service.py

@@ -15,10 +15,14 @@ _CONFIG_FILENAME = "app_config.json"
 
 
 def load_config():
-    """Load app config from JSON. Returns defaults merged with file values.
+    """
+    从 JSON 文件加载应用配置。
 
-    Never raises: missing file → info log + defaults;
-                  damaged file → warning log + defaults.
+    返回默认配置与文件配置的合并字典。如果配置文件不存在、损坏或无法读取，
+    函数不会抛出异常，而是记录日志并返回默认配置。
+
+    Returns:
+        dict: 合并后的配置字典
     """
     from services.file_service import get_config_path
     config_file = get_config_path(_CONFIG_FILENAME)