feat(i18n): add multilingual platform descriptions and HostWizard demo data

- Add description_translations JSON column to Platform model + migration
- Add language tabs to platform admin edit form for multilingual descriptions
- Update API schemas to include description_translations in request/response
- Translate pricing section UI labels via _t() macro (monthly/annual/CTA/etc.)
- Add Luxembourgish (lb) support to all platforms (OMS, Main, Loyalty, Hosting)
- Seed description_translations, contact emails, and social links for all platforms
- Add LuxWeb Agency demo merchant with hosting stores, team, and content pages
- Fix language code typo: lu → lb in platform-edit.js availableLanguages
- Fix store content pages to use correct primary platform instead of hardcoded OMS

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/modules/cms/templates/cms/platform/sections/_pricing.html

@@ -11,7 +11,7 @@
 #}
 
 {# Helper macro: resolve a TranslatableText field with fallback #}
-{% macro _t(field, fallback='') %}
+{% macro _t(field, lang, default_lang, fallback='') %}
 {%- if field and field.translations -%}
     {{ field.translations.get(lang) or field.translations.get(default_lang) or fallback }}
 {%- else -%}
@@ -25,12 +25,12 @@
     <div class="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
         {# Section header #}
         <div class="text-center mb-12">
-            {% set title = _t(pricing.title, 'Simple, Transparent Pricing') %}
+            {% set title = _t(pricing.title, lang, default_lang, 'Simple, Transparent Pricing') %}
             <h2 class="text-3xl md:text-4xl font-bold text-gray-900 dark:text-white mb-4">
                 {{ title }}
             </h2>
 
-            {% set subtitle = _t(pricing.subtitle) %}
+            {% set subtitle = _t(pricing.subtitle, lang, default_lang) %}
             {% if subtitle|trim %}
             <p class="text-lg text-gray-600 dark:text-gray-400 max-w-2xl mx-auto">
                 {{ subtitle }}
@@ -40,13 +40,13 @@
 
         {# Pricing toggle (monthly/annual) #}
         {% if pricing.use_subscription_tiers and tiers %}
-        {% set monthly_label = _t(pricing.monthly_label, 'Monthly') %}
-        {% set annual_label = _t(pricing.annual_label, 'Annual') %}
-        {% set save_text = _t(pricing.save_text, 'Save 2 months!') %}
-        {% set popular_badge = _t(pricing.popular_badge, 'Most Popular') %}
-        {% set cta_text = _t(pricing.cta_text, 'Start Free Trial') %}
-        {% set per_month = _t(pricing.per_month_label, '/month') %}
-        {% set per_year = _t(pricing.per_year_label, '/year') %}
+        {% set monthly_label = _t(pricing.monthly_label, lang, default_lang, 'Monthly') %}
+        {% set annual_label = _t(pricing.annual_label, lang, default_lang, 'Annual') %}
+        {% set save_text = _t(pricing.save_text, lang, default_lang, 'Save 2 months!') %}
+        {% set popular_badge = _t(pricing.popular_badge, lang, default_lang, 'Most Popular') %}
+        {% set cta_text = _t(pricing.cta_text, lang, default_lang, 'Start Free Trial') %}
+        {% set per_month = _t(pricing.per_month_label, lang, default_lang, '/month') %}
+        {% set per_year = _t(pricing.per_year_label, lang, default_lang, '/year') %}
 
         <div x-data="{ annual: false }" class="space-y-8">
             {# Billing toggle #}
@@ -128,7 +128,7 @@
         </div>
         {% else %}
         {# Placeholder when no tiers available #}
-        {% set coming_soon = _t(pricing.coming_soon_text, 'Pricing plans coming soon') %}
+        {% set coming_soon = _t(pricing.coming_soon_text, lang, default_lang, 'Pricing plans coming soon') %}
         <div class="text-center text-gray-500 dark:text-gray-400 py-8">
             {{ coming_soon }}
         </div>