Rename to pqn-node; extract hardware to pqn-hardware dependency

[marcosfrenkel]

Summary

• Extract hardware code into a new pqn-hardware repo (already merged there, pinned here by commit SHA).
• Rename the Python package: src/pqnstack/ → src/pqn_node/ (the app/ level is dropped since the whole repo is now the Node).
• Rename the distribution: pqnstack → pqn-node. Entry point: pqn → pqn-node.
• Rewrite every import that used pqnstack.{base,network,pqn} to pull from pqn_hardware.*; the hardware package is now a git-pinned dep in pyproject.toml.

What's in here

• src/pqn_node/ — renamed package (FastAPI app, config, cli, cron_manager, daily_report, constants).
• pyproject.toml — new distribution name, entry point, and dependency on pqn-hardware @ git+...@6440be2; drops numpy, pyfirmata2, pyzmq, thorlabs-apt-device (they come transitively via pqn-hardware).
• README.md — rewritten to describe the node-only scope and point at pqn-hardware for router/provider docs.
• src/pqn_node/cli.py — keeps toggle-game and daily-report; start-provider/start-router moved to pqn-hw in the hardware repo. InvalidNetworkConfigurationError usage in toggle_game replaced with typer.BadParameter (app-level input validation, not a network config error).

Test plan

• uv sync succeeds and resolves pqn-hardware from the pinned SHA.
• uv run python -c "from pqn_node.main import app; from pqn_hardware.measurement import MeasurementConfig; from pqn_hardware.network.client import Client" imports cleanly.
• uv run pqn-node --help lists toggle-game and daily-report.
• All 9 route modules (chsh, coordination, debug, games, health, qkd, rng, serial, timetagger) import cleanly.
• pytest tests/ passes.
• git grep "pqnstack" returns no hits in tracked source (only binary PNG metadata remains).

Notes for reviewers

• The rename preserves git rename detection: git log --follow src/pqn_node/main.py (and every other file under the new path) traces back to the original src/pqnstack/app/ location.
• MeasurementConfig was moved into pqn-hardware (it's hardware-adjacent and shared); it is imported here via pqn_hardware.measurement.
• cron_manager.py and daily_report.py stayed in this repo because they're exercised only through the CLI and aren't part of the web app runtime.

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