Release a Windows-friendly runtime zip (v2.7.12)

The releases carried the wheel and the sdist; the only zip was GitHub's source
archive of the whole repository (tests, CI, tools).  A Windows user just wants
to extract a folder and double-click start.bat.

- scripts/build_release_zip.py builds simtrace-analyser-<version>.zip with a
  single top-level directory: the two Python packages, the PWA runtime files
  (frontend/tests and package.json stay out), the four launchers, the udev
  rule, the READMEs and the screenshot.  The .bat entries are written with
  CRLF line endings (cmd.exe mishandles bare-LF labels/goto), the .sh files
  keep their executable bit; LICENSE is included automatically once the repo
  has one.
- tests/test_release_zip.py pins the archive shape, the exclusions, the sw.js
  PRECACHE drift (every precached asset must travel), the CRLF/LF line endings
  and start.sh's mode.
- the release workflow builds the zip, checks it carries start.bat and the
  PWA, uploads it with the run and attaches it to the release.
- READMEs (EN/RU) and the release-notes template offer the zip as the
  Windows-friendly option; version 2.7.12, PWA cache v94.

Verified: the built zip (34 entries, 658 KB compressed) extracted and started
on Linux serves the same index.html; 553 Python + 80 Node tests.

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "simtrace-analyser"
-version = "2.7.11"
+version = "2.7.12"
 description = "SIMtrace Analyser — APDU trace analyser for GSMTAP/PCAP captures (bundles the simtrace2-pysniff utility)"
 readme = {file = "README.md", content-type = "text/markdown"}
 license = {text = "GPL-2.0-or-later"}