create org model and schema manager

db/migrate/20250611160914_create_organizations.rb

@@ -0,0 +1,21 @@
+class CreateOrganizations < ActiveRecord::Migration[8.0]
+  def change
+    # Enable pgcrypto extension for UUID support
+    enable_extension 'pgcrypto' if connection.adapter_name == 'PostgreSQL'
+
+    create_table :organizations, id: :uuid do |t|
+      t.string :name
+      t.string :subdomain
+      t.string :email_domain
+      t.string :logo_url
+      t.string :address
+      t.string :website
+      t.string :phone_number
+
+      t.timestamps
+    end
+
+    add_index :organizations, :subdomain, unique: true
+    add_reference :users, :organization, null: false, foreign_key: true, type: :uuid
+  end
+end