Replace hardcoded domains with primary domain setting

app/controllers/admin/users_controller.rb

@@ -4,7 +4,7 @@ class Admin::UsersController < Admin::BaseController
 
   def index
     ldap   = LdapService.new
-    @ou    = params[:ou] || "kosmos.org"
+    @ou    = params[:ou] || Setting.primary_domain
     @orgs  = ldap.fetch_organizations
     @pagy, @users = pagy(User.where(ou: @ou).order(cn: :asc))
 

app/controllers/signup_controller.rb

@@ -88,7 +88,7 @@ class SignupController < ApplicationController
     if session[:new_user].present?
       @user = User.new(session[:new_user])
     else
-      @user = User.new(ou: "kosmos.org")
+      @user = User.new(ou: Setting.primary_domain)
     end
   end
 
@@ -98,7 +98,7 @@ class SignupController < ApplicationController
 
     CreateAccount.call(
       username: @user.cn,
-      domain: "kosmos.org",
+      domain: Setting.primary_domain,
       email: @user.email,
       password: @user.password,
       invitation: @invitation

app/controllers/webhooks_controller.rb

@@ -30,7 +30,7 @@ class WebhooksController < ApplicationController
   def notify_xmpp(address, amt_sats, memo)
     payload = {
       type: "normal",
-      from: "kosmos.org", # TODO domain config
+      from: Setting.primary_domain,
       to: address,
       subject: "Sats received!",
       body: "#{helpers.number_with_delimiter amt_sats} sats received in your Lightning wallet:\n> #{memo}"