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>

mkdocs.yml

@@ -277,6 +277,8 @@ nav:
       - Subscription & Billing: features/subscription-billing.md
       - Email System: features/email-system.md
       - User Journeys:
+        - Prospecting: features/user-journeys/prospecting.md
+        - Hosting: features/user-journeys/hosting.md
         - Loyalty: features/user-journeys/loyalty.md
 
     # --- User Guides ---