feat(hosting): add industry template infrastructure (Workstream 3B)

5 industry templates as JSON presets, each with theme + multi-page content:
- generic: clean minimal (homepage, about, contact)
- restaurant: warm tones, Playfair Display (homepage, about, menu, contact)
- construction: amber/earth tones, Montserrat (homepage, services, projects, contact)
- auto-parts: red/bold, parts-focused (homepage, catalog, contact)
- professional-services: navy/blue, Merriweather (homepage, services, team, contact)

Each template has:
- meta.json (name, description, tags, languages)
- theme.json (colors, fonts, layout, header style)
- pages/*.json (section-based homepage + content pages with i18n)
- {{placeholder}} variables for prospect data injection

TemplateService loads from templates_library/ directory with caching.
GET /admin/hosting/sites/templates endpoint to list available templates.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/modules/hosting/templates_library/professional-services/meta.json

@@ -0,0 +1 @@
+{"id": "professional-services", "name": "Professional Services", "description": "Template for lawyers, accountants, consultants, and agencies", "tags": ["professional", "consulting", "legal", "finance"], "languages": ["en", "fr", "de"]}

app/modules/hosting/templates_library/professional-services/pages/contact.json

@@ -0,0 +1,13 @@
+{
+  "slug": "contact",
+  "title": "Contact",
+  "title_translations": {"en": "Contact Us", "fr": "Contactez-nous", "de": "Kontakt"},
+  "template": "default",
+  "is_published": true,
+  "show_in_header": true,
+  "show_in_footer": true,
+  "content_translations": {
+    "en": "<h2>Contact Us</h2>\n<p>Schedule a consultation or reach out with any questions.</p>\n<ul>\n<li>Phone: {{phone}}</li>\n<li>Email: {{email}}</li>\n<li>Address: {{address}}</li>\n</ul>",
+    "fr": "<h2>Contactez-nous</h2>\n<p>Planifiez une consultation ou posez-nous vos questions.</p>\n<ul>\n<li>Téléphone : {{phone}}</li>\n<li>Email : {{email}}</li>\n<li>Adresse : {{address}}</li>\n</ul>"
+  }
+}

app/modules/hosting/templates_library/professional-services/pages/homepage.json

@@ -0,0 +1,34 @@
+{
+  "slug": "homepage",
+  "title": "{{business_name}}",
+  "template": "full",
+  "is_published": true,
+  "sections": {
+    "hero": {
+      "enabled": true,
+      "title": {"translations": {"en": "{{business_name}}", "fr": "{{business_name}}"}},
+      "subtitle": {"translations": {"en": "Professional expertise you can trust", "fr": "Une expertise professionnelle de confiance"}},
+      "background_type": "gradient",
+      "buttons": [
+        {"label": {"translations": {"en": "Book a Consultation", "fr": "Prendre rendez-vous"}}, "url": "/contact", "style": "primary"},
+        {"label": {"translations": {"en": "Our Expertise", "fr": "Notre expertise"}}, "url": "/services", "style": "secondary"}
+      ]
+    },
+    "features": {
+      "enabled": true,
+      "title": {"translations": {"en": "Areas of Expertise", "fr": "Domaines d'expertise"}},
+      "items": [
+        {"icon": "briefcase", "title": {"translations": {"en": "Advisory", "fr": "Conseil"}}, "description": {"translations": {"en": "Strategic guidance tailored to your needs", "fr": "Conseils stratégiques adaptés à vos besoins"}}},
+        {"icon": "document-text", "title": {"translations": {"en": "Compliance", "fr": "Conformité"}}, "description": {"translations": {"en": "Ensure regulatory compliance across your operations", "fr": "Assurez la conformité réglementaire de vos opérations"}}},
+        {"icon": "chart-bar", "title": {"translations": {"en": "Analysis", "fr": "Analyse"}}, "description": {"translations": {"en": "Data-driven insights for informed decisions", "fr": "Analyses basées sur les données pour des décisions éclairées"}}}
+      ]
+    },
+    "cta": {
+      "enabled": true,
+      "title": {"translations": {"en": "Need professional guidance?", "fr": "Besoin d'un accompagnement professionnel ?"}},
+      "buttons": [
+        {"label": {"translations": {"en": "Schedule a Meeting", "fr": "Planifier un rendez-vous"}}, "url": "/contact", "style": "primary"}
+      ]
+    }
+  }
+}

app/modules/hosting/templates_library/professional-services/pages/services.json

@@ -0,0 +1,12 @@
+{
+  "slug": "services",
+  "title": "Services",
+  "title_translations": {"en": "Our Services", "fr": "Nos Services", "de": "Unsere Leistungen"},
+  "template": "default",
+  "is_published": true,
+  "show_in_header": true,
+  "content_translations": {
+    "en": "<h2>Our Services</h2>\n<p>We provide comprehensive professional services to help your business thrive.</p>",
+    "fr": "<h2>Nos Services</h2>\n<p>Nous proposons des services professionnels complets pour aider votre entreprise à prospérer.</p>"
+  }
+}

app/modules/hosting/templates_library/professional-services/pages/team.json

@@ -0,0 +1,12 @@
+{
+  "slug": "team",
+  "title": "Team",
+  "title_translations": {"en": "Our Team", "fr": "Notre Équipe", "de": "Unser Team"},
+  "template": "default",
+  "is_published": true,
+  "show_in_header": true,
+  "content_translations": {
+    "en": "<h2>Our Team</h2>\n<p>Meet the professionals behind {{business_name}}.</p>",
+    "fr": "<h2>Notre Équipe</h2>\n<p>Découvrez les professionnels derrière {{business_name}}.</p>"
+  }
+}

app/modules/hosting/templates_library/professional-services/theme.json

@@ -0,0 +1,8 @@
+{
+  "theme_name": "modern",
+  "colors": {"primary": "#1e40af", "secondary": "#1e3a8a", "accent": "#3b82f6", "background": "#f8fafc", "text": "#0f172a", "border": "#cbd5e1"},
+  "font_family_heading": "Merriweather",
+  "font_family_body": "Source Sans Pro",
+  "layout_style": "grid",
+  "header_style": "fixed"
+}