Admin configuration

RuniqueApp::builder(config)
    .with_admin(|a| {
        a.site_title("My Administration")
         .auth(RuniqueAdminAuth::new())
         .routes(admins::routes("/admin"))
         // Custom dashboard (optional)
         .templates(|t| t.with_dashboard("admin/my_dashboard.html"))
         .with_state(admins::admin_state())
    })

// The AdminAuth interface specifies how
// a user attempting to log into the admin is validated.

// By default, Runique provides DefaultAdminAuth:
pub struct MyAdminAuth;

#[async_trait]
impl AdminAuth for MyAdminAuth {
    async fn authenticate(&self, username: &str, password: &str, db: &DatabaseConnection) -> Option<AdminLoginResult> {
        // Custom verification code...
        None
    }
}

// In the builder:
.auth(MyAdminAuth)

// For each resource declared in admin!:
GET    /admin/                    → dashboard
GET    /admin/article/            → list
GET    /admin/article/create/     → create form
POST   /admin/article/create/     → create handler
GET    /admin/article/{id}/edit/  → edit form
POST   /admin/article/{id}/edit/  → edit handler
POST   /admin/article/{id}/delete/ → delete