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

tools/fw_info.py

@@ -0,0 +1,10 @@
+#!/usr/bin/env python3
+"""fw_info: 打印 DA14585 镜像头信息（JSON）。"""
+import json, sys
+from pathlib import Path
+from fw import parse_image
+
+if __name__ == "__main__":
+    data = Path(sys.argv[1]).read_bytes()
+    info = parse_image(data)
+    print(json.dumps({k: (hex(v) if isinstance(v, int) else v) for k, v in info.items()}, indent=2))