README: stop framing the runtime zip as Windows-only

The zip is just an archive: it extracts and runs on any OS, and the release's
Source code assets are offered as zip as well as tar.gz, so users pick the
format they prefer.  The section is now "Zip (no installer)" (RU "Zip (без
установки)") and says the archive works on any OS; the Windows/Linux start
commands stay as instructions, not as the section's rationale.  The
source-archive note names both formats, and the release-notes template
follows.

README.md

@@ -64,11 +64,11 @@ gh release download --pattern '*.whl'
 pip install ./simtrace_analyser-*.whl
 ```
 
-### 2. Zip (Windows-friendly, no installer)
+### 2. Zip (no installer)
 
 Download `simtrace-analyser-2.7.13.zip` from the release page and extract it
 anywhere: it is the runtime tree (the Python packages, the web UI, the launchers
-and the docs — no tests, no git).  Then run:
+and the docs — no tests, no git).  The archive works on any OS; then run:
 
 Windows:
 
@@ -85,8 +85,8 @@ Linux/macOS:
 Python 3 has to be on `PATH`; `pip install pyusb` is only needed for direct
 SIMtrace2 capture.  The launchers accept the server's options
 (`start.bat --capture direct`, `./start.sh --capture direct --port 8080`).
-(The release's *Source code* archive is the full tree including tests; it
-works like a clone below.)
+(The release's *Source code (zip / tar.gz)* archives are the full tree
+including tests; they work like a clone below.)
 
 ### 3. Git clone (development)