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.
- napalm-device-types >=4.21.1 is now declared: the driver imports
  MediaDriver, PortSpec and FingerprintRule from it, and CI used to
  install it by hand.
- requires-python >=3.10 (napalm-device-types needs it), LICENSE, README,
  CHANGELOG, py.typed, SPDX license string, setuptools>=77, version floors
  on the dev extra, links to git.netork.io; .gitignore as in the template.
- mypy strict for the package; napalm_sonos.sonos_driver is exempt for now
  (5 errors, two of them return types that differ from MediaDriver's),
  recorded in the quality baseline.
- Coverage floor 71 % (measured 71.30 %).

README.md

@@ -0,0 +1,63 @@
+# napalm-sonos
+
+NAPALM driver for **Sonos** speakers, built on
+[napalm-device-types](https://git.netork.io/NAPALM/napalm-device-types) (`MediaDriver`).
+It talks to the speaker through [SoCo](https://github.com/SoCo/SoCo).
+
+## Tested against
+
+| Model | Firmware |
+|---|---|
+| not recorded yet | |
+
+## Connection
+
+UPnP/SOAP over HTTP on port 1400, through SoCo. A Sonos speaker takes no login:
+`username` and `password` are accepted for NAPALM's constructor and ignored.
+`open()` reads the speaker info once; `is_alive()` checks that TCP port 1400 accepts
+a connection.
+
+```python
+from napalm import get_network_driver
+
+driver = get_network_driver("sonos")
+with driver("192.0.2.20") as speaker:
+    print(speaker.get_facts())
+    print(speaker.get_playback_state())
+```
+
+## Supported
+
+| Getter / action | |
+|---|---|
+| `get_facts` | from the speaker info read at `open()` |
+| `get_interfaces`, `get_interfaces_ip` | `eth0` when the speaker is wired, always `wlan0` |
+| `get_playback_state`, `get_current_track` | yes |
+| `get_volume`, `set_volume`, `get_mute`, `set_mute` | yes |
+| `play`, `pause`, `stop`, `next_track`, `previous_track` | yes |
+| `get_group_info`, `get_zone_info` | yes |
+
+## Not supported
+
+Configuration management (`load_replace_candidate` and `load_merge_candidate` raise
+`NotImplementedError`), the CLI, and every routing, LLDP, ARP, NTP, SNMP, BGP, user
+and environment getter: they return empty results.
+
+## Installation
+
+```bash
+pip install napalm-sonos
+```
+
+## 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