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 from PyPI (the README no longer installs
  it from git), py.typed, SPDX license string, setuptools>=77, version
  floors on the dev extra, Issues and Changelog links on git.netork.io.
- mypy strict for the package; napalm_bsd.base, napalm_bsd.freebsd and
  napalm_bsd.openbsd are exempt for now (28 errors, mostly getters typed
  as plain dicts rather than the device-types TypedDicts), recorded in the
  quality baseline with three complex parsers. parse.py is strict after a
  one-line annotation.
- Coverage floor 94 % (measured 94.63 %).

CHANGELOG.md

@@ -7,6 +7,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+- The drivers follow the NAPALM driver standard
+  (https://git.netork.io/NAPALM/driver-standard): CI on Gitea runs ruff, mypy, the
+  tests on Python 3.10–3.13 and at the lowest declared versions, bandit, pip-audit and
+  a build check, and a release tag publishes to PyPI. The package now ships `py.typed`.
+  Python 3.10 stays the floor. napalm-device-types now comes from PyPI, 4.21.1 or later.
+
 ### Security
 - The SSH host key is verified (NetOrk/netork#1167). `open()` takes the key to expect from `optional_args["ssh_host_key"]` and refuses any other one before it logs in (`SshHostKeyMismatch`); without one it accepts the first key. Every key it sees goes to `optional_args["ssh_host_key_observer"]`. Replaces paramiko's `AutoAddPolicy`. Requires napalm-device-types 4.19.0; version 0.4.0.