feat: add official EmDash marketing template

- Marketing landing page with hero, features, testimonials, FAQ, pricing
- EmDash CMS with pages collection and marketing blocks
- Full seed data with all content sections
- Dockerfile with entrypoint for database persistence
- Responsive design with CSS variables

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

entrypoint.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+# Only seed on first launch (when data.db doesn't exist or is empty)
+if [ ! -f data.db ] || ! sqlite3 data.db "SELECT COUNT(*) FROM content" 2>/dev/null | grep -q "^[1-9]"; then
+  echo "Database missing or empty, running emdash init & seed..."
+  pnpm exec emdash init
+  pnpm exec emdash seed
+else
+  echo "Database exists with content, starting normally..."
+fi
+exec node ./dist/server/entry.mjs