Initial commit: Site Builder with PHP API backend

Visual drag-and-drop website builder using GrapesJS with:
- Multi-page editor with live preview
- File-based asset storage via PHP API (no localStorage base64)
- Template library, Docker support, and Playwright test suite

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

templates/index.json

@@ -0,0 +1,82 @@
+[
+  {
+    "id": "landing-saas",
+    "name": "SaaS Landing Page",
+    "description": "Modern landing page for software products with gradient hero, feature grid, pricing, and testimonials.",
+    "category": "Business",
+    "tags": ["modern", "professional", "gradient", "saas"],
+    "useCase": "Software products, SaaS startups, digital services",
+    "file": "landing-saas.html",
+    "colors": ["#6366f1", "#8b5cf6", "#1e1b4b"]
+  },
+  {
+    "id": "portfolio-designer",
+    "name": "Creative Portfolio",
+    "description": "Stunning portfolio for designers and developers with project showcases, about section, and contact form.",
+    "category": "Portfolio",
+    "tags": ["creative", "minimal", "dark", "portfolio"],
+    "useCase": "Designers, developers, photographers, freelancers",
+    "file": "portfolio-designer.html",
+    "colors": ["#f97316", "#1c1917", "#fafaf9"]
+  },
+  {
+    "id": "business-agency",
+    "name": "Agency Homepage",
+    "description": "Professional agency website with services, case studies, team section, and client logos.",
+    "category": "Business",
+    "tags": ["professional", "corporate", "clean", "agency"],
+    "useCase": "Consulting firms, marketing agencies, professional services",
+    "file": "business-agency.html",
+    "colors": ["#0ea5e9", "#0f172a", "#f8fafc"]
+  },
+  {
+    "id": "restaurant-cafe",
+    "name": "Restaurant & Cafe",
+    "description": "Elegant restaurant page with menu highlights, ambiance photos, reservation CTA, and location info.",
+    "category": "Business",
+    "tags": ["elegant", "warm", "food", "restaurant"],
+    "useCase": "Restaurants, cafes, bars, bakeries, food businesses",
+    "file": "restaurant-cafe.html",
+    "colors": ["#b45309", "#1c1917", "#fef3c7"]
+  },
+  {
+    "id": "resume-cv",
+    "name": "Personal Resume",
+    "description": "Clean, professional resume/CV page with skills, experience timeline, education, and contact details.",
+    "category": "Personal",
+    "tags": ["minimal", "professional", "resume", "personal"],
+    "useCase": "Job seekers, professionals, freelancers",
+    "file": "resume-cv.html",
+    "colors": ["#2563eb", "#1e293b", "#f1f5f9"]
+  },
+  {
+    "id": "app-showcase",
+    "name": "App Showcase",
+    "description": "Mobile app landing page with device mockups, feature highlights, download buttons, and app screenshots.",
+    "category": "Business",
+    "tags": ["modern", "colorful", "app", "mobile"],
+    "useCase": "Mobile apps, app launches, app marketing",
+    "file": "app-showcase.html",
+    "colors": ["#06b6d4", "#7c3aed", "#0f172a"]
+  },
+  {
+    "id": "event-conference",
+    "name": "Event & Conference",
+    "description": "Event landing page with countdown feel, speaker lineup, schedule, venue info, and ticket CTA.",
+    "category": "Business",
+    "tags": ["bold", "modern", "event", "conference"],
+    "useCase": "Conferences, workshops, meetups, webinars",
+    "file": "event-conference.html",
+    "colors": ["#e11d48", "#fbbf24", "#0f172a"]
+  },
+  {
+    "id": "coming-soon",
+    "name": "Coming Soon",
+    "description": "Beautiful coming soon page with email signup, countdown placeholder, and social links.",
+    "category": "Personal",
+    "tags": ["minimal", "gradient", "launch", "coming-soon"],
+    "useCase": "Product launches, under construction, pre-launch",
+    "file": "coming-soon.html",
+    "colors": ["#8b5cf6", "#ec4899", "#1e1b4b"]
+  }
+]