De-vibe: Add real backend with Cloudflare D1 + API

[doctor-ew]

Summary

• Added Cloudflare D1 database with resources and submissions tables
• Created API routes for fetching resources and submitting suggestions
• Fixed form to actually save submissions (was only console.log)
• Added admin panel at /admin/submissions for reviewing submissions
• Added rate limiting and HTTP Basic Auth
• Updated all pages to fetch from API instead of hardcoded data
• Added GitHub Actions for automatic deploys

Setup Required

See DOCS/DEPLOYMENT_GUIDE.md for complete setup instructions.

Files Added

• wrangler.toml - Cloudflare config
• db/schema.sql - Database schema
• app/api/* - API routes
• app/admin/* - Admin panel
• .github/workflows/deploy.yml - CI/CD

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