Massive refactor. Merge forward_auth into App, remove references to unimplemented OIDC federation and SAML features. Add group and user custom claims. Groups now allocate which apps a user can use

app/models/group.rb

@@ -6,4 +6,9 @@ class Group < ApplicationRecord
 
   validates :name, presence: true, uniqueness: { case_sensitive: false }
   normalizes :name, with: ->(name) { name.strip.downcase }
+
+  # Parse custom_claims JSON field
+  def parsed_custom_claims
+    custom_claims || {}
+  end
 end