feat(tcp): include type in wifi hello line

Made-with: Cursor

src/main.py

@@ -126,6 +126,7 @@ hello = {
     "v": "1",
     "device_name": settings.get("name", ""),
     "mac": ubinascii.hexlify(mac).decode().lower(),
+    "type": "led",
 }
 hello_bytes = json.dumps(hello).encode("utf-8")
 hello_line = hello_bytes + b"\n"