docs: fix version compatibility (PWA vs server majors), broaden descriptions, drop the header slogan (v2.3.1)

- version check in pysimConnect() now compares the server major against
  SIMPLE_VERSION (2.3.1) instead of the hardcoded 1.x assumption; the header
  version is rendered from the same constant
- removed the 'SIM OTA with a Human Face' slogan (span, i18n key, translate
  hook) to free header space
- broaden the PWA description in manifest.json/package.json and the help
  overview (EN/RU): APDU workbench, OTA lab, CAT/STK simulator, card profiler
- version compatibility tables in README/RUS, help EN/RU and docs/api.md now
  describe the major-version rule
- README/RUS: Cards promoted to a top-level section; EN duplicate
  Theme/Localisation sections removed
- docs: /api/cardinfo documented; SCP81 'expose framing options' next-work
  item dropped (done); local AGENTS.md not-implemented note corrected
- SW cache simple-v190

frontend/manifest.json

@@ -1,7 +1,7 @@
 {
   "name": "SIMple",
   "short_name": "SIMple",
-  "description": "Offline APDU helper for SIM/USIM/RAM commands",
+  "description": "UICC/SIM workbench: APDU toolkit, SIM OTA (SCP80/SCP81), STK/CAT simulator, card profiler",
   "start_url": "index.html",
   "display": "standalone",
   "background_color": "#fafafa",