feat: Add proxy route to routes/api.php

[zigzagdev]

Parent issue

#475

Overview

Add the image proxy route to routes/api.php so that incoming requests are dispatched to HeritageImageController@proxyImage.

Implementation

Route::get('/heritage-image/{id}', [App\Http\Controllers\HeritageImageController::class, 'proxyImage']);

Acceptance criteria

• GET /api/heritage-image/{id} routes to HeritageImageController@proxyImage