Fix Vercel deployment: Tailwind CSS, API endpoints, and Bun runtime

- Add missing /api/patterns.js endpoint (was causing 404)
- Fix Tailwind CSS: compile with @tailwindcss/cli instead of Bun virtual module
- Update API handlers to use standard Vercel function export format
- Configure vercel.json with proper Bun runtime (runtime: "bun@1")
- Add @tailwindcss/cli to devDependencies
- Add generated styles.css to .gitignore

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

api/patterns.js

@@ -0,0 +1,6 @@
+import { getPatterns } from "../server/lib/api-handlers.js";
+
+export default async function handler(request) {
+  const patterns = await getPatterns();
+  return Response.json(patterns);
+}