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/config.py

@@ -0,0 +1,31 @@
+# app/modules/hosting/config.py
+"""
+Module configuration.
+
+Environment-based configuration using Pydantic Settings.
+Settings are loaded from environment variables with HOSTING_ prefix.
+
+Example:
+    HOSTING_DEFAULT_BILLING_PERIOD=annual
+"""
+from pydantic_settings import BaseSettings
+
+
+class ModuleConfig(BaseSettings):
+    """Configuration for hosting module."""
+
+    # Default billing period for new services
+    default_billing_period: str = "monthly"
+
+    # Days before expiry to trigger renewal alerts
+    renewal_alert_days: int = 30
+
+    # Default currency for pricing
+    default_currency: str = "EUR"
+
+    model_config = {"env_prefix": "HOSTING_"}
+
+
+# Export for auto-discovery
+config_class = ModuleConfig
+config = ModuleConfig()