README: add architecture diagrams (EN/RU)

Both READMEs gain a capture-and-analysis diagram right under the screenshot:
simtrace2-pysniff and sigrok_iso7816_stream feed the GSMTAP UDP :4729
listener, SIMtrace2 hardware can be read directly over USB, PCAP/COMPRION
traces come from files, and simtrace-analyser-server decodes/stores into
SQLite and serves the web UI.  The SVGs carry title/desc and role=img, use
only inline presentation attributes (no scripts, no external refs) and render
without clipped text; the RU text matches the EN layout.

The runtime zip includes both diagrams so the embedded READMEs keep working,
and a new drift guard checks that every image a README references is present
in the archive.  RU wording: "устанавливаемое PWA" (neuter agreement).

558 Python + 80 Node tests.

README.md

@@ -13,6 +13,8 @@ GSMTAP into this analyser.
 
 ![SIMtrace Analyser UI](frontend.png)
 
+![Capture and analysis: simtrace2-pysniff (SIMtrace2 hardware) and sigrok_iso7816_stream (FX2) stream GSMTAP-SIM to the UDP :4729 listener; alternatively the server reads SIMtrace2 hardware directly over USB, and PCAP/COMPRION traces are imported from files; simtrace-analyser-server decodes and stores the traffic in SQLite and serves the web UI](architecture_en.svg)
+
 ## Prerequisites
 
 **Required**