feat: Implement initial structure for Directus Mayo API extension

- Added main router in src/index.js to register endpoints.
- Implemented GET /mayo-api/products to fetch product list with pagination and filters.
- Implemented GET /mayo-api/dictionaries to fetch various dictionaries for frontend use.
- Created separate files for routes, repositories, serializers, and utilities to maintain clean architecture.
- Added utility functions for async handling, pagination, and order search parsing.
- Introduced serializers for products and dictionaries to format data for frontend consumption.
- Established repository functions for database queries related to products and dictionaries.
- Updated package.json to include license information.
- Created documentation for the API extension detailing current state and future implementation plans.

directus/extensions/directus-extension-mayo-api/README.md

@@ -0,0 +1,16 @@
+# Directus Mayo API Extension
+
+Custom Directus endpoint extension for Duck Prod Manager.
+
+The extension exposes frontend-facing API routes under:
+
+```txt
+/mayo-api
+```
+
+Current implemented routes:
+
+```txt
+GET /mayo-api/products
+GET /mayo-api/dictionaries
+```