rename OTAMan → SIMple (v2.3.0)

- package pysim_otaman_server → pysim_simple_server; distribution and
  console script pysim-otaman-server → pysim-simple-server
- PWA branding SIMple: title, header, manifest, help EN/RU, GitHub links
- localStorage keys otaman_* → simple_* (clean break, no migration)
- export filenames simple-cards.json / simple-custom-files.json
- service worker cache simple-v189
- README/docs/setup/start scripts updated; no 'otaman' left in the tree

frontend/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "otaman",
+  "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.",
   "main": "index.js",
@@ -10,7 +10,7 @@
   },
   "repository": {
     "type": "git",
-    "url": "https://github.com/anttro/otaman.git"
+    "url": "https://github.com/anttro/simple.git"
   },
   "keywords": [],
   "type": "commonjs",