Update admin theme/layout and refresh README details.

Align the project baseline with the latest admin interface styling and layout structure while documenting setup and usage updates in README.

apps/api/app/db/models.py

@@ -0,0 +1,12 @@
+from app.modules.auth.models import EmailVerificationToken, PasswordResetToken, RefreshToken
+from app.modules.content.models import ContentPage
+from app.modules.users.models import User, UserProfile
+
+__all__ = [
+    "User",
+    "UserProfile",
+    "RefreshToken",
+    "PasswordResetToken",
+    "EmailVerificationToken",
+    "ContentPage",
+]