refactor: rename public routes and templates to platform

Complete the public -> platform naming migration across the codebase.
This aligns with the naming convention where "platform" refers to
the marketing/public-facing pages of the platform itself.

Changes:
- Update all imports from public to platform modules
- Update template references from public/ to platform/
- Update route registrations to use platform prefix
- Update documentation to reflect new naming
- Update test files for platform API endpoints

Files affected:
- app/api/main.py - router imports
- app/modules/*/routes/*/platform.py - route definitions
- app/modules/*/templates/*/platform/ - template files
- app/modules/routes.py - route discovery
- docs/* - documentation updates
- tests/integration/api/v1/platform/ - test files

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/modules/cms/templates/cms/platform/content-page.html

@@ -1,6 +1,6 @@
 {# app/templates/platform/content-page.html #}
 {# Generic template for platform content pages (About, FAQ, Terms, Contact, etc.) #}
-{% extends "public/base.html" %}
+{% extends "platform/base.html" %}
 
 {% block title %}{{ page.title }} - Marketplace{% endblock %}
 

app/modules/cms/templates/cms/platform/homepage-default.html

@@ -1,6 +1,6 @@
 {# app/templates/platform/homepage-default.html #}
 {# Default platform homepage template with section-based rendering #}
-{% extends "public/base.html" %}
+{% extends "platform/base.html" %}
 
 {# Import section partials #}
 {% from 'platform/sections/_hero.html' import render_hero %}

app/modules/cms/templates/cms/platform/homepage-minimal.html

@@ -1,6 +1,6 @@
 {# app/templates/platform/homepage-minimal.html #}
 {# Minimal/clean platform homepage template #}
-{% extends "public/base.html" %}
+{% extends "platform/base.html" %}
 
 {% block title %}
     {% if page %}{{ page.title }}{% else %}Home{% endif %} - Marketplace

app/modules/cms/templates/cms/platform/homepage-modern.html

@@ -1,6 +1,6 @@
 {# app/templates/platform/homepage-modern.html #}
 {# Wizamart OMS - Luxembourg-focused homepage inspired by Veeqo #}
-{% extends "public/base.html" %}
+{% extends "platform/base.html" %}
 
 {% block title %}
     Wizamart - The Back-Office for Letzshop Sellers

app/modules/cms/templates/cms/platform/homepage-wizamart.html

@@ -1,6 +1,6 @@
 {# app/templates/platform/homepage-wizamart.html #}
 {# Wizamart Marketing Homepage - Letzshop OMS Platform #}
-{% extends "public/base.html" %}
+{% extends "platform/base.html" %}
 {% from 'shared/macros/inputs.html' import toggle_switch %}
 
 {% block title %}Wizamart - Order Management for Letzshop Sellers{% endblock %}
@@ -407,7 +407,7 @@ function homepageData() {
             this.vendorResult = null;
 
             try {
-                const response = await fetch('/api/v1/public/letzshop-vendors/lookup', {
+                const response = await fetch('/api/v1/platform/letzshop-vendors/lookup', {
                     method: 'POST',
                     headers: { 'Content-Type': 'application/json' },
                     body: JSON.stringify({ url: this.shopUrl })