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/package.json

@@ -1,7 +1,7 @@
 {
   "name": "simple",
   "version": "1.0.0",
-  "description": "Standalone offline HTML/JS tool for building APDU commands for SIM, USIM, and GlobalPlatform RAM, plus encoding conversions.",
+  "description": "SIMple — a UICC workbench: APDU toolkit, SCP80/SCP81 OTA lab, STK/CAT (phone) simulator and card profiler.",
   "main": "index.js",
   "scripts": {
     "build": "npx tailwindcss -i src/style.css -o style.css --config tailwind.config.js && cat src/contrast.css >> style.css",