feat(hosting): add HostWizard platform module and fix migration chain

- Add complete hosting module (models, routes, schemas, services, templates, migrations)
- Add HostWizard platform to init_production seed (code=hosting, domain=hostwizard.lu)
- Fix cms_002 migration down_revision to z_unique_subdomain_domain
- Fix prospecting_001 migration to chain after cms_002 (remove branch label)
- Add hosting/prospecting version_locations to alembic.ini
- Fix admin_services delete endpoint to use proper response model
- Add hostwizard.lu to deployment docs (DNS, Caddy, Cloudflare)
- Add hosting and prospecting user journey docs to mkdocs nav

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

alembic.ini

@@ -3,7 +3,7 @@
 script_location = alembic
 prepend_sys_path = .
 version_path_separator = space
-version_locations = alembic/versions app/modules/billing/migrations/versions app/modules/cart/migrations/versions app/modules/catalog/migrations/versions app/modules/cms/migrations/versions app/modules/customers/migrations/versions app/modules/dev_tools/migrations/versions app/modules/inventory/migrations/versions app/modules/loyalty/migrations/versions app/modules/marketplace/migrations/versions app/modules/messaging/migrations/versions app/modules/orders/migrations/versions app/modules/tenancy/migrations/versions
+version_locations = alembic/versions app/modules/billing/migrations/versions app/modules/cart/migrations/versions app/modules/catalog/migrations/versions app/modules/cms/migrations/versions app/modules/customers/migrations/versions app/modules/dev_tools/migrations/versions app/modules/hosting/migrations/versions app/modules/inventory/migrations/versions app/modules/loyalty/migrations/versions app/modules/marketplace/migrations/versions app/modules/messaging/migrations/versions app/modules/orders/migrations/versions app/modules/prospecting/migrations/versions app/modules/tenancy/migrations/versions
 # This will be overridden by alembic\env.py using settings.database_url
 sqlalchemy.url =
 # for PROD: sqlalchemy.url = postgresql://username:password@localhost:5432/ecommerce_db