docs: align the READMEs, help and API reference with the current UI (v3.0.1)

- docs/api.md: document GET /api/net-state and POST /api/net-state-refresh
  (state shape, monitored keys, refresh filter, 503); add eid/euicc to
  /api/status; correct the /api/net-sim FPLMN wording (roaming_denied
  appends, attach clears; 5GS files untouched) and its response
  (net_state); move the stray /api/event-send example back into its
  section; refresh the version examples to 3.x.
- README/RUS: Cards — ADM field, the three TARs, the SCP80/SCP81
  fieldsets and the header markers; File Browser — Read raw/Read decoded
  pills, Edit raw, named FCI block, Verify ADM; Profiler — Clone, three
  list tabs; Custom files — root/parent/FID/alias form, canonical paths,
  cascade delete, legacy-path resolution; Phone simulator — three pills,
  eSIM, Network state monitor, Home network button, corrected FPLMN
  wording, proactive-log row content; RU CLI table gaps (--sms-oa/
  --sms-sm-sc, --terminal-profile, --mcc-mnc-list) and the missing
  event-form bullets.
- help EN/RU: three profiler list tabs, 3.x compatibility example.
- Version 3.0.1 (docs release), sw.js simple-v228.

frontend/index.html

@@ -1436,7 +1436,7 @@
 // ===== Version =====
 // Single source of truth for the PWA version: shown in the header and used
 // by the server version check in pysimConnect().
-const SIMPLE_VERSION = '3.0.0';
+const SIMPLE_VERSION = '3.0.1';
 document.getElementById('app-version').textContent = 'v' + SIMPLE_VERSION;
 
 // ===== Tab switching =====