feat(tools): fw_info/fw_pack 镜像解析重打包（CRC32验证+字节级往返），112 测试全绿

pyproject.toml

@@ -22,5 +22,5 @@ ppclock = "ppclock.cli:main"
 where = ["src"]
 
 [tool.pytest.ini_options]
-pythonpath = ["src"]
+pythonpath = ["src", "."]
 testpaths = ["tests"]