Add aiodp login demo theme

[mrorro]

Change(s)

Change Type: Added

Change Category: Interface

Changelog Entry: Add authentication/themes/aiodp, a new demo login theme for Keycloak v26.5.4.

How to Test

1. Copy the new theme into the Keycloak themes/ directory, usually '/opt/keycloak/themes/'
2. In the Keycloak Admin Console, go to Realm Settings → Themes, and select the new demo theme as the Login Theme
3. Open the login page and verify it renders properly

Checklist

• Tests have been added or updated to reflect the changes, or their absence is explicitly explained.
• Documentation has been added or updated to reflect the changes, or their absence is explicitly explained.
• A self-review has been conducted checking:
  • No unintended changes have been committed.
  • The changes in isolation seem reasonable.
  • Anything that may be odd or unintuitive is provided with a GitHub comment explaining it (but consider if this should not be a code comment or in the documentation instead).
• All CI checks pass before pinging a reviewer, or provide an explanation if they do not.
• The PR title matches the changelog entry's one-line description.

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