fix: reading skills on Windows (#6490)

There is an issue with reading the skill directory on the Windows system, which results in a high probability of files under the skill directory being unrecognizable, now fix it.

astrbot/core/skills/skill_manager.py

@@ -136,7 +136,7 @@ def _build_skill_read_command_example(path: str) -> str:
         return f"cat {path}"
     if _is_windows_prompt_path(path):
         command = "type"
-        path_arg = f'"{path}"'
+        path_arg = f'"{os.path.normpath(path)}"'
     else:
         command = "cat"
         path_arg = shlex.quote(path)