transform admin panel with comprehensive professional UI

- migrate from SQLite to PostgreSQL with Drizzle ORM
- implement comprehensive AdminLayout with expandable sidebar navigation
- create professional dashboard with real-time charts and metrics
- add advanced monitoring, reporting, and export functionality
- fix menu alignment and remove non-existent pages
- eliminate duplicate headers and improve UI consistency
- add Tailwind CSS v3 for professional styling
- expand database schema from 6 to 15 tables
- implement role-based access control and API key management
- create comprehensive settings, monitoring, and system info pages

postcss.config.js

@@ -0,0 +1,6 @@
+module.exports = {
+  plugins: {
+    tailwindcss: {},
+    autoprefixer: {},
+  },
+}