Initial commit: prompt template manager

React + Tailwind frontend, FastAPI backend, settings.json storage.
Supports preset CRUD, live variable filling, and AI rewrite via OpenAI.

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

frontend/tailwind.config.js

@@ -0,0 +1,5 @@
+export default {
+  content: ['./index.html', './src/**/*.{js,jsx}'],
+  theme: { extend: {} },
+  plugins: [],
+}