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>

.gitignore

@@ -0,0 +1,35 @@
+# Storage (uploaded assets and project data are local/per-deployment)
+storage/assets/*
+storage/projects/*
+storage/tmp/*
+!storage/assets/.gitkeep
+!storage/projects/.gitkeep
+!storage/tmp/.gitkeep
+
+# Uploads from image-resize
+uploads/
+
+# Node modules (test dependencies)
+node_modules/
+
+# Playwright
+test-results/
+playwright-report/
+.playwright-mcp/
+
+# Python cache
+__pycache__/
+
+# Screenshots (generated during testing)
+tests/screenshots/
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# IDE
+.vscode/
+.idea/
+
+# Claude settings (local)
+.claude/