fix: restore mypy ratchet after Windows updates

app/main.py

@@ -8,7 +8,7 @@ import sys
 if os.name == "nt":
     psql_exe = shutil.which("psql")
     if psql_exe:
-        os.add_dll_directory(os.path.dirname(psql_exe))
+        getattr(os, "add_dll_directory")(os.path.dirname(psql_exe))
 
 def _prepare_direct_execution_import_path() -> None:
     """

app/runtime/state.py

@@ -251,7 +251,8 @@ class SystemHelper(ConfigReloadMixin):
         """
         执行Windows重启操作
         """
-        def cmd(command: list) -> Tuple[bool, str]:
+        def cmd(command: list[str]) -> Tuple[bool, str]:
+            """通过 Windows 命令解释器执行重启命令。"""
             try:
                 subprocess.run(command, shell=True)
                 return True, ""