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/construction/meta.json

@@ -0,0 +1 @@
+{"id": "construction", "name": "Construction & Renovation", "description": "Professional template for builders, renovators, and tradespeople", "tags": ["construction", "renovation", "building", "trades"], "languages": ["en", "fr", "de"]}

app/modules/hosting/templates_library/construction/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>Get a Free Quote</h2>\n<p>Tell us about your project and we'll get back to you within 24 hours.</p>\n<ul>\n<li>Phone: {{phone}}</li>\n<li>Email: {{email}}</li>\n<li>Address: {{address}}</li>\n</ul>",
+    "fr": "<h2>Demandez un devis gratuit</h2>\n<p>Décrivez-nous votre projet et nous vous recontacterons sous 24h.</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/construction/pages/homepage.json

@@ -0,0 +1,40 @@
+{
+  "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": "Quality construction and renovation in {{city}}", "fr": "Construction et rénovation de qualité à {{city}}"}},
+      "background_type": "image",
+      "buttons": [
+        {"label": {"translations": {"en": "Get a Free Quote", "fr": "Devis gratuit"}}, "url": "/contact", "style": "primary"},
+        {"label": {"translations": {"en": "Our Projects", "fr": "Nos réalisations"}}, "url": "/projects", "style": "secondary"}
+      ]
+    },
+    "features": {
+      "enabled": true,
+      "title": {"translations": {"en": "Our Services", "fr": "Nos Services"}},
+      "items": [
+        {"icon": "home", "title": {"translations": {"en": "New Construction", "fr": "Construction neuve"}}, "description": {"translations": {"en": "Custom-built homes and commercial buildings", "fr": "Maisons et bâtiments commerciaux sur mesure"}}},
+        {"icon": "wrench", "title": {"translations": {"en": "Renovation", "fr": "Rénovation"}}, "description": {"translations": {"en": "Complete interior and exterior renovation", "fr": "Rénovation complète intérieure et extérieure"}}},
+        {"icon": "color-swatch", "title": {"translations": {"en": "Painting & Finishing", "fr": "Peinture & Finitions"}}, "description": {"translations": {"en": "Professional painting and finishing work", "fr": "Travaux de peinture et finitions professionnels"}}},
+        {"icon": "shield-check", "title": {"translations": {"en": "Insulation", "fr": "Isolation"}}, "description": {"translations": {"en": "Energy-efficient insulation solutions", "fr": "Solutions d'isolation éco-énergétiques"}}}
+      ]
+    },
+    "testimonials": {
+      "enabled": true,
+      "title": {"translations": {"en": "What Our Clients Say", "fr": "Témoignages de nos clients"}},
+      "items": []
+    },
+    "cta": {
+      "enabled": true,
+      "title": {"translations": {"en": "Ready to start your project?", "fr": "Prêt à démarrer votre projet ?"}},
+      "buttons": [
+        {"label": {"translations": {"en": "Request a Quote", "fr": "Demander un devis"}}, "url": "/contact", "style": "primary"}
+      ]
+    }
+  }
+}

app/modules/hosting/templates_library/construction/pages/projects.json

@@ -0,0 +1,12 @@
+{
+  "slug": "projects",
+  "title": "Projects",
+  "title_translations": {"en": "Our Projects", "fr": "Nos Réalisations", "de": "Unsere Projekte"},
+  "template": "default",
+  "is_published": true,
+  "show_in_header": true,
+  "content_translations": {
+    "en": "<h2>Our Projects</h2>\n<p>Browse our portfolio of completed construction and renovation projects.</p>",
+    "fr": "<h2>Nos Réalisations</h2>\n<p>Découvrez notre portfolio de projets de construction et rénovation réalisés.</p>"
+  }
+}

app/modules/hosting/templates_library/construction/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 offer a comprehensive range of construction and renovation services.</p>\n<h3>Construction</h3>\n<p>From foundations to finishing touches, we handle every aspect of new builds.</p>\n<h3>Renovation</h3>\n<p>Transform your existing space with our expert renovation team.</p>\n<h3>Painting & Decoration</h3>\n<p>Professional interior and exterior painting services.</p>",
+    "fr": "<h2>Nos Services</h2>\n<p>Nous proposons une gamme complète de services de construction et rénovation.</p>\n<h3>Construction</h3>\n<p>Des fondations aux finitions, nous gérons chaque aspect des constructions neuves.</p>\n<h3>Rénovation</h3>\n<p>Transformez votre espace avec notre équipe de rénovation experte.</p>\n<h3>Peinture & Décoration</h3>\n<p>Services professionnels de peinture intérieure et extérieure.</p>"
+  }
+}

app/modules/hosting/templates_library/construction/theme.json

@@ -0,0 +1,15 @@
+{
+  "theme_name": "modern",
+  "colors": {
+    "primary": "#d97706",
+    "secondary": "#92400e",
+    "accent": "#fbbf24",
+    "background": "#fafaf9",
+    "text": "#1c1917",
+    "border": "#d6d3d1"
+  },
+  "font_family_heading": "Montserrat",
+  "font_family_body": "Open Sans",
+  "layout_style": "grid",
+  "header_style": "fixed"
+}