Refactor app architecture and clean local artifacts

Backend/Security/AdminRoles.cs

@@ -0,0 +1,40 @@
+namespace Backend.Security;
+
+public static class AdminRoles
+{
+    public const string Viewer = "viewer";
+    public const string ContentAdmin = "content_admin";
+    public const string Admin = "admin";
+    public const string Owner = "owner";
+
+    public static string Normalize(string? role)
+    {
+        var normalizedRole = (role ?? string.Empty).Trim().ToLowerInvariant().Replace('-', '_');
+
+        return normalizedRole switch
+        {
+            Owner => Owner,
+            Admin => Admin,
+            ContentAdmin => ContentAdmin,
+            _ => Viewer,
+        };
+    }
+
+    public static bool IsKnownRole(string? role)
+    {
+        var normalizedRole = (role ?? string.Empty).Trim().ToLowerInvariant().Replace('-', '_');
+        return normalizedRole is Viewer or ContentAdmin or Admin or Owner;
+    }
+
+    public static bool CanAccessAdmin(string? role) =>
+        Normalize(role) is ContentAdmin or Admin or Owner;
+
+    public static bool CanManageContent(string? role) =>
+        Normalize(role) is ContentAdmin or Admin or Owner;
+
+    public static bool CanManageAdminWorkspace(string? role) =>
+        Normalize(role) is Admin or Owner;
+
+    public static bool CanManageOperationalSettings(string? role) =>
+        Normalize(role) is Owner;
+}