chore: Add created_at field to Adventure and Collection models

frontend/src/routes/adventures/+page.svelte

@@ -300,6 +300,15 @@
 					/>
 					<br />
 					<p class="text-md font-semibold mt-2 mb-2">Order By</p>
+					<label for="name">Created At</label>
+					<input
+						type="radio"
+						name="order_by"
+						id="created_at"
+						class="radio radio-primary"
+						checked
+						value="created_at"
+					/>
 					<label for="name">Name</label>
 					<input
 						type="radio"