Add sso_audit_logs association and clear logs in demo data cleaner (#638)

- Added `has_many :sso_audit_logs` association to `User` model with `dependent: :nullify`.
- Updated `Demo::DataCleaner` to clear SSO audit logs before destroying related data.

Co-authored-by: Josh Waldrep <joshua.waldrep5+github@gmail.com>

app/models/demo/data_cleaner.rb

@@ -8,6 +8,9 @@ class Demo::DataCleaner
 
   # Main entry point for destroying all demo data
   def destroy_everything!
+    # Clear SSO audit logs first (they reference users)
+    SsoAuditLog.destroy_all
+
     Family.destroy_all
     Setting.destroy_all
     InviteCode.destroy_all

app/models/user.rb

@@ -13,6 +13,7 @@ class User < ApplicationRecord
   has_many :impersonator_support_sessions, class_name: "ImpersonationSession", foreign_key: :impersonator_id, dependent: :destroy
   has_many :impersonated_support_sessions, class_name: "ImpersonationSession", foreign_key: :impersonated_id, dependent: :destroy
   has_many :oidc_identities, dependent: :destroy
+  has_many :sso_audit_logs, dependent: :nullify
   accepts_nested_attributes_for :family, update_only: true
 
   validates :email, presence: true, uniqueness: true, format: { with: URI::MailTo::EMAIL_REGEXP }