feat: KKS P240/P241 蓝牙工牌管理系统初始提交

FastAPI + SQLAlchemy + asyncio TCP 服务器，支持设备管理、实时定位、
告警、考勤打卡、蓝牙记录、指令下发、TTS语音播报等功能。

app/protocol/__init__.py

@@ -0,0 +1,20 @@
+"""
+KKS Bluetooth Badge Protocol
+
+Provides packet parsing, building, and CRC computation for the
+KKS Bluetooth badge communication protocol over TCP.
+"""
+
+from .constants import *  # noqa: F401,F403
+from .crc import crc_itu, verify_crc
+from .parser import PacketParser
+from .builder import PacketBuilder
+
+__all__ = [
+    # CRC
+    "crc_itu",
+    "verify_crc",
+    # Classes
+    "PacketParser",
+    "PacketBuilder",
+]