feat(*): refactor dynamic vs. static structure and distinctions; make additional elements dynamic

app/Classes/BookFetcher.php

@@ -0,0 +1,24 @@
+<?php
+
+  namespace App\Classes;
+
+  class BookFetcher extends PageFetcher
+  {
+    public function fetch(string $url): ?array
+    {
+      $cacheKey = "book_" . md5($url);
+      $cached = $this->cacheGet($cacheKey);
+
+      if ($cached) return $cached;
+
+      $book = $this->fetchSingleFromApi("optimized_books", $url);
+
+      if (!$book) return null;
+
+      $book['globals'] = $this->getGlobals();
+
+      $this->cacheSet($cacheKey, $book);
+
+      return $book;
+    }
+  }