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>

app/modules/hosting/routes/pages/__init__.py

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+# app/modules/hosting/routes/pages/__init__.py

app/modules/hosting/routes/pages/admin.py

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+# app/modules/hosting/routes/pages/admin.py
+"""
+Hosting Admin Page Routes (HTML rendering).
+
+Admin pages for hosted site management:
+- Dashboard - Overview with KPIs and charts
+- Sites - Hosted site list with filters
+- Site Detail - Single site view with tabs (overview, services, store link)
+- Site New - Create new hosted site form
+- Clients - All services overview with expiry warnings
+"""
+
+from fastapi import APIRouter, Depends, Path, Request
+from fastapi.responses import HTMLResponse
+from sqlalchemy.orm import Session
+
+from app.api.deps import get_db, require_menu_access
+from app.modules.core.utils.page_context import get_admin_context
+from app.modules.enums import FrontendType
+from app.modules.tenancy.models import User
+from app.templates_config import templates
+
+router = APIRouter()
+
+
+@router.get("/hosting", response_class=HTMLResponse, include_in_schema=False)
+async def admin_hosting_dashboard(
+    request: Request,
+    current_user: User = Depends(require_menu_access("hosting-dashboard", FrontendType.ADMIN)),
+    db: Session = Depends(get_db),
+):
+    """Render hosting dashboard page."""
+    return templates.TemplateResponse(
+        "hosting/admin/dashboard.html",
+        get_admin_context(request, db, current_user),
+    )
+
+
+@router.get("/hosting/sites", response_class=HTMLResponse, include_in_schema=False)
+async def admin_hosting_sites(
+    request: Request,
+    current_user: User = Depends(require_menu_access("hosting-sites", FrontendType.ADMIN)),
+    db: Session = Depends(get_db),
+):
+    """Render hosted sites list page."""
+    return templates.TemplateResponse(
+        "hosting/admin/sites.html",
+        get_admin_context(request, db, current_user),
+    )
+
+
+@router.get("/hosting/sites/new", response_class=HTMLResponse, include_in_schema=False)
+async def admin_hosting_site_new(
+    request: Request,
+    current_user: User = Depends(require_menu_access("hosting-sites", FrontendType.ADMIN)),
+    db: Session = Depends(get_db),
+):
+    """Render new hosted site form."""
+    return templates.TemplateResponse(
+        "hosting/admin/site-new.html",
+        get_admin_context(request, db, current_user),
+    )
+
+
+@router.get(
+    "/hosting/sites/{site_id}",
+    response_class=HTMLResponse,
+    include_in_schema=False,
+)
+async def admin_hosting_site_detail(
+    request: Request,
+    site_id: int = Path(..., description="Hosted Site ID"),
+    current_user: User = Depends(require_menu_access("hosting-sites", FrontendType.ADMIN)),
+    db: Session = Depends(get_db),
+):
+    """Render hosted site detail page."""
+    context = get_admin_context(request, db, current_user)
+    context["site_id"] = site_id
+    return templates.TemplateResponse(
+        "hosting/admin/site-detail.html",
+        context,
+    )
+
+
+@router.get("/hosting/clients", response_class=HTMLResponse, include_in_schema=False)
+async def admin_hosting_clients(
+    request: Request,
+    current_user: User = Depends(require_menu_access("hosting-clients", FrontendType.ADMIN)),
+    db: Session = Depends(get_db),
+):
+    """Render all client services overview page."""
+    return templates.TemplateResponse(
+        "hosting/admin/clients.html",
+        get_admin_context(request, db, current_user),
+    )

app/modules/hosting/routes/pages/public.py

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+# app/modules/hosting/routes/pages/public.py
+"""
+Hosting Public Page Routes.
+
+Public-facing routes for POC site viewing:
+- POC Viewer - Shows the Store's storefront with a HostWizard preview banner
+"""
+
+from fastapi import APIRouter, Depends, Path, Request
+from fastapi.responses import HTMLResponse
+from sqlalchemy.orm import Session
+
+from app.core.database import get_db
+from app.templates_config import templates
+
+router = APIRouter()
+
+
+@router.get(
+    "/hosting/sites/{site_id}/preview",
+    response_class=HTMLResponse,
+    include_in_schema=False,
+)
+async def poc_site_viewer(
+    request: Request,
+    site_id: int = Path(..., description="Hosted Site ID"),
+    db: Session = Depends(get_db),
+):
+    """Render POC site viewer with HostWizard preview banner."""
+    from app.modules.hosting.models import HostedSite, HostedSiteStatus
+
+    site = db.query(HostedSite).filter(HostedSite.id == site_id).first()
+
+    # Only allow viewing for poc_ready or proposal_sent sites
+    if not site or site.status not in (HostedSiteStatus.POC_READY, HostedSiteStatus.PROPOSAL_SENT):
+        return HTMLResponse(content="<h1>Site not available for preview</h1>", status_code=404)
+
+    context = {
+        "request": request,
+        "site": site,
+        "store_url": f"/stores/{site.store.subdomain}" if site.store else "#",
+    }
+    return templates.TemplateResponse(
+        "hosting/public/poc-viewer.html",
+        context,
+    )