feat: Grav 2.0 compat — flex accounts/pages, api.super permission

- accounts.type: flex (required by admin2 API)
- pages.type: flex (required for admin2 pages API)
- Add access.api.super + api.access to mischa account (admin2 uses api.* permissions, not admin.*)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

accounts/mischa.yaml

@@ -1,13 +1,16 @@
 login: mischa
+state: enabled
+title: Mischa
+email: mischa@gorinskat.nl
+fullname: Mischa
+hashed_password: $2y$10$koiWKjhhipph4uTbm7fWjOj79uwxfE/mYSXGKANrAvUrSqezY3xL2
+language: en
 access:
   admin:
     login: true
     super: true
   site:
     login: true
-state: enabled
-title: Mischa
-email: mischa@gorinskat.nl
-fullname: Mischa
-hashed_password: '$2y$10$dUEYTopGEDouFoAa/Wxw6.vsOA71yr3gSStfDvr10aKm4ih9ObQ7m'
-language: en
+  api:
+    super: true
+    access: true