feat: add Modrinth import option to admin UI

src/views/admin/ModpacksView.vue

@@ -10,7 +10,7 @@
                     <select v-model="form.importerType">
                         <option value="simple">Простой ZIP</option>
                         <option value="curseforge">CurseForge</option>
-                        <option value="modrinth" disabled>Modrinth (в разработке)</option>
+                        <option value="modrinth">Modrinth (.mrpack)</option>
                     </select>
                 </div>
 
@@ -41,8 +41,8 @@
 
                 <!-- Поля для источника -->
                 <div v-if="form.importMethod === 'file'" class="form-group">
-                    <label for="modpack-file">Файл модпака (.zip)</label>
-                    <input id="modpack-file" type="file" @change="onFileSelected" :required="form.importMethod === 'file'" accept=".zip" />
+                    <label for="modpack-file">Файл модпака (.zip, .mrpack)</label>
+                    <input id="modpack-file" type="file" @change="onFileSelected" :required="form.importMethod === 'file'" accept=".zip,.mrpack" />
                 </div>
                 <div v-if="form.importMethod === 'url'" class="form-group">
                     <label for="sourceUrl">URL страницы модпака на CurseForge</label>