implement show copyright info on album page

+ rewrite server track and album models to use destructuring

src/views/album/Content.vue

@@ -1,7 +1,19 @@
 <template>
   <div class="album-tracks rounded">
     <div v-for="(disc, key) in discs" class="album-disc">
-      <SongList :key="key" :tracks="disc" :on_album_page="true" :disc="key" />
+      <SongList
+        :key="key"
+        :tracks="disc"
+        :on_album_page="true"
+        :disc="key"
+        :copyright="
+          () => {
+            if (isLastDisc(key)) {
+              return copyright;
+            }
+          }
+        "
+      />
     </div>
   </div>
 </template>
@@ -10,11 +22,18 @@
 import { Track } from "@/interfaces";
 import SongList from "@/components/FolderView/SongList.vue";
 
-defineProps<{
+const props = defineProps<{
   discs: {
     [key: string]: Track[];
   };
+  copyright: string;
 }>();
+
+// check if the disc is the last disc
+const isLastDisc = (disc: string | number) => {
+  const discs = Object.keys(props.discs);
+  return discs[discs.length - 1] === disc;
+};
 </script>
 
 <style lang="scss">