fix(protocol): RXTX 命令通道切换到 331f（实机证据：1f1f 仅ACK不执行）+ 设备ID反解参数序校正（实机向量），150 测试全绿

tests/test_bridge.py

@@ -99,7 +99,8 @@ async def test_write_channels_and_hex(server):
         await t.write_rxtx(bytes([0xE2]), response=False)
     w = [r for r in s.received if r["op"] == "write"]
     assert w[0]["char"] == "epd" and w[0]["data"] == "03ff"
-    assert w[1]["char"] == "rxtx" and w[1]["data"] == "e2" and w[1]["response"] is False
+    # RXTX 写走 alt(331f) 活通道（实机证据）
+    assert w[1]["char"] == "alt" and w[1]["data"] == "e2" and w[1]["response"] is False
 
 
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