feat: add safe BLE discovery and network baseline tools

tests/test_ble_scanner.py

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+from bleak.backends.device import BLEDevice
+from bleak.backends.scanner import AdvertisementData
+
+from k1link.ble.scanner import advertisement_record
+
+
+def test_advertisement_record_marks_k1_candidate() -> None:
+    device = BLEDevice("TEST-UUID", "Unknown", details=None)
+    advertisement = AdvertisementData(
+        local_name="Lixel-K1-1234",
+        manufacturer_data={123: b"\x01\x02"},
+        service_data={"service": b"\xaa"},
+        service_uuids=["B", "a"],
+        tx_power=-4,
+        rssi=-52,
+        platform_data=(),
+    )
+    record = advertisement_record(device, advertisement)
+    assert record["k1_name_candidate"] is True
+    assert record["id_kind"] == "corebluetooth_uuid"
+    assert record["manufacturer_data_hex"] == {"123": "0102"}
+    assert record["service_data_hex"] == {"service": "aa"}
+    assert record["service_uuids"] == ["B", "a"]