Print lamp ID labels on the Brother QL-820NWB

label_printer.py renders a DK-11221 23x23 mm label (QR code linking
to the lamp's buildfor.life page plus the ID) and sends it over the
network backend (brother-ql-next). The station prints two after each
successful measurement, one for the box and one for the lamp; printer
failures never lose a run, and any lamp can be reprinted with
uv run label_printer.py <ID>. Printer address via HPCS_LABEL_PRINTER
or --printer.

pyproject.toml

@@ -7,4 +7,7 @@ requires-python = ">=3.11"
 dependencies = [
     "pyserial>=3.5",
     "colour-science>=0.4.4",
+    "qrcode>=8.2",
+    "pillow>=12.3.0",
+    "brother-ql-next>=0.12.0",
 ]