fix: serve the eSIM GET endpoints from _do_GET; release v3.0.0

The three eSIM GET routes were inserted after the POST-only
/api/verify-adm branch, i.e. into the _do_POST chain, so GET
/api/esim/chip|profiles|notifications fell through to the 404 handler
(only POST /api/esim/profile was reachable).

- Moved /api/esim/chip|profiles|notifications into _do_GET (after
  /api/status); /api/esim/profile stays in _do_POST.
- Regression test: inspect the handler sources and assert each route is
  in the right chain.
- Version 3.0.0 (eSIM support is a major update): server/pyproject/PWA
  header, sw.js simple-v227.

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 = '2.8.1';
+const SIMPLE_VERSION = '3.0.0';
 document.getElementById('app-version').textContent = 'v' + SIMPLE_VERSION;
 
 // ===== Tab switching =====

frontend/sw.js

@@ -1,4 +1,4 @@
-const CACHE = 'simple-v226';
+const CACHE = 'simple-v227';
 const URLS = [
   'index.html',
   'help.html',