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.

tests/test_esim.py

@@ -6,6 +6,7 @@ monkeypatched with canned responses, so the mapping to the JSON API and the
 ISD-R selection/restore logic are tested without hardware.
 """
 
+import inspect
 import unittest
 from types import SimpleNamespace
 
@@ -192,5 +193,18 @@ class EsimTests(unittest.TestCase):
             esim.chip_info(app)
 
 
+class EsimRoutingTests(unittest.TestCase):
+    def test_esim_routes_are_in_the_right_http_handlers(self):
+        from pysim_simple_server import server
+        get_src = inspect.getsource(server.PysimHandler._do_GET)
+        post_src = inspect.getsource(server.PysimHandler._do_POST)
+        for route in ('/api/esim/chip', '/api/esim/profiles',
+                      '/api/esim/notifications'):
+            self.assertIn("self.path == '%s'" % route, get_src, route)
+            self.assertNotIn("self.path == '%s'" % route, post_src, route)
+        self.assertIn("self.path == '/api/esim/profile'", post_src)
+        self.assertNotIn("self.path == '/api/esim/profile'", get_src)
+
+
 if __name__ == '__main__':
     unittest.main()