feat: Bolt Card writer CLI for PC/SC NFC readers

Provision, inspect and wipe NTAG 424 DNA Bolt Cards from a Linux PC
using an LNbits /boltcards/api/v1/auth link, replacing the phone app
for desks with a USB reader (ACR1252U).

- pcsc.py: ctypes client for libpcsclite (no compiled deps)
- ntag424.py: EV2 secure messaging (AuthenticateEV2First, ChangeKey,
  ChangeFileSettings, GetCardUID, WriteData) per NT4H2421Gx / AN12196
- boltcard.py: the same write/wipe sequence as bolt-card-programmer
  (NDEF URL, SDM 40 00E0 C1 FF12, keys 1-4 then 0, key version 1)
  plus local p/c verification identical to the extension's nxp424.py
- cli.py: readers / read / write / wipe, keys backed up before any
  card mutation, uid cross-check on wipe

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

.gitignore

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+.venv/
+__pycache__/
+*.pyc
+*.egg-info/
+dist/
+build/
+.pytest_cache/
+.ruff_cache/
+result