feat: add inventory management system with product, category, and movement tracking

- Implemented global styles using Tailwind CSS for consistent theming.
- Created layout component to structure the application with a navigation bar.
- Developed Movements page to handle inventory entries and exits, including form submission and data display.
- Added Products page for listing, editing, and deleting products with API integration.
- Introduced Categories management functionality.
- Built Navbar component for easy navigation across the application.
- Established API service for handling requests to the backend.
- Defined TypeScript types for Category, Product, and InventoryMovement to ensure type safety.
- Configured TypeScript settings for the project.

frontend/postcss.config.mjs

@@ -0,0 +1,7 @@
+const config = {
+  plugins: {
+    "@tailwindcss/postcss": {},
+  },
+};
+
+export default config;