fix: enable email sign-in method alongside username in all modes

The sign-in experience must always include both email+password and
username+password methods. The admin user signs in with their email
(admin@company.com) which the sign-in UI detects as email type.
With only username method enabled, Logto rejects it with "this
sign-in method is not activated."

Fixes both bootstrap Phase 8c and EmailConnectorService disable path.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker/logto-bootstrap.sh

@@ -593,6 +593,12 @@ api_patch "/api/sign-in-exp" '{
   "signInMode": "SignIn",
   "signIn": {
     "methods": [
+      {
+        "identifier": "email",
+        "password": true,
+        "verificationCode": false,
+        "isPasswordPrimary": true
+      },
       {
         "identifier": "username",
         "password": true,

src/main/java/net/siegeln/cameleer/saas/vendor/EmailConnectorService.java

@@ -138,6 +138,7 @@ public class EmailConnectorService {
                 ),
                 "signIn", Map.of(
                     "methods", List.of(
+                        Map.of("identifier", "email", "password", true, "verificationCode", false, "isPasswordPrimary", true),
                         Map.of("identifier", "username", "password", true, "verificationCode", false, "isPasswordPrimary", true)
                     )
                 )