chore: adopt the NAPALM driver standard

- CI moves to .gitea/workflows/ci.yml and calls the shared driver workflow
  of NAPALM/driver-standard; .github/ is gone.
- requires-python >=3.10 (napalm-device-types needs it), floor
  napalm-device-types>=4.21.1 (was napalm_device_types>=0.4.0), LICENSE
  file, py.typed, SPDX license string, links to git.netork.io, a dev extra
  with floors.
- README (pyproject named one that did not exist) and CHANGELOG.md.
- mypy strict for the package; napalm_zyxel.zyxel_driver is exempt for now
  (24 errors), recorded in the quality baseline with its two complex
  functions. Coverage floor 68 % (measured 68.97 %).

Closes #8

README.md

@@ -0,0 +1,68 @@
+# napalm-zyxel
+
+NAPALM driver for Zyxel VMG series residential gateways (VMG4005-B50A and similar), built on
+[napalm-device-types](https://git.netork.io/NAPALM/napalm-device-types)
+(`ResidentialGatewayDriver`).
+
+## Tested against
+
+| Model | Firmware |
+|---|---|
+| not recorded yet | not recorded yet |
+
+## Connection
+
+The gateway's web API (the Zyxel DAL protocol) over HTTP on port 80, or HTTPS on port 443
+with `use_tls`. The driver fetches the gateway's RSA public key, sends a fresh AES key
+encrypted with it, and logs in with the web interface account; every request and response
+after that is AES-encrypted.
+
+```python
+from napalm import get_network_driver
+
+driver = get_network_driver("zyxel")
+with driver("192.0.2.1", "admin", "secret", optional_args={"use_tls": True}) as device:
+    print(device.get_facts())
+```
+
+| Optional argument | Default | Meaning |
+|---|---|---|
+| `use_tls` | `False` | HTTPS instead of HTTP |
+| `port` | `443` with `use_tls`, else `80` | port of the web interface |
+| `verify` | `False` | verify the gateway's TLS certificate |
+
+## Supported
+
+| Getter / action | Source |
+|---|---|
+| `get_facts` | basic device information |
+| `get_interfaces`, `get_interfaces_ip` | basic device information (WAN, LAN, Wi-Fi) |
+| `get_arp_table` | derived from the active LAN hosts |
+| `get_wan_status` | basic device information |
+| `get_hosts` | DAL `LAN_HOSTS`, else the DHCP page |
+| `get_port_forwards`, `get_nat_translations` | DAL `NAT_PORTMAP`, else the status page |
+| `get_wireless_clients`, `get_ssids`, `get_radio_status` | DAL, else the wireless page |
+| `get_diagnostics` | DAL `DIAGNOSTICS` |
+| `ping` | DAL `PINGTEST` |
+| `is_alive` | TCP connect to the web port |
+| `reboot_host` | DAL `REBOOT` |
+| `restart_wifi` | DAL `WIFI_RESTART` |
+
+## Not supported
+
+Configuration changes (`load_merge_candidate` and `load_replace_candidate` raise
+`NotImplementedError`), `get_config`, LLDP, BGP, NTP, SNMP, users, routes, MAC address
+table, optics, environment, traceroute, VPN tunnels and the CLI.
+
+## Development
+
+The rules are in [STANDARDS.md](https://git.netork.io/NAPALM/driver-standard/src/branch/main/STANDARDS.md).
+
+```bash
+python -m venv .venv && .venv/bin/pip install -e ".[dev]"
+.venv/bin/pytest --cov
+```
+
+## License
+
+Apache-2.0