Switch mods to per-folder auto-discovery and resourcepack to single zip

- PackDefinition: replace mods[]/resourcepacks[] with modsFolder (string) + resourcepackPath (string); drop PackAsset
- Editor: replace dynamic add/remove lists with two single inputs; remove the now-dead JS for adding/removing rows
- Server: expose GET /file/mods/<folder>/index.json that returns the list of .jar names; folder name restricted to [a-zA-Z0-9_-]+
- Installer: fetch the listing JSON and download each jar from /file/mods/<folder>/<file>.jar; download the single resourcepack from /file/resourcepacks/<file>.zip directly into resourcepacks/

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

views/op/dashboard.ejs

@@ -38,7 +38,7 @@
                 <ul class="metaList">
                   <li>MC <%= item.definition.mcVersion %></li>
                   <li>플랫폼 <%= item.definition.platform.type %></li>
-                  <li>모드 <%= item.definition.mods.length %>개</li>
+                  <li>모드 폴더 <%= item.definition.modsFolder || '없음' %></li>
                 </ul>
               <% } %>
             </a>

views/op/editor.ejs

@@ -80,33 +80,18 @@
         </label>
       </div>
 
-      <fieldset class="dynamicListFieldset">
-        <legend>모드 (.jar)</legend>
-        <div class="dynamicList" data-list="mods">
-          <% pack.mods.forEach(function (mod) { %>
-            <div class="dynamicRow">
-              <input name="modName" placeholder="모드 이름" value="<%= mod.name %>" />
-              <input name="modUrl" placeholder="다운로드 URL" value="<%= mod.downloadUrl %>" />
-              <button type="button" class="dangerLink dynamicRemove">삭제</button>
-            </div>
-          <% }) %>
-        </div>
-        <button type="button" class="secondaryButton" data-add="mods">모드 추가</button>
-      </fieldset>
-
-      <fieldset class="dynamicListFieldset">
-        <legend>리소스팩 (.zip)</legend>
-        <div class="dynamicList" data-list="resourcepacks">
-          <% pack.resourcepacks.forEach(function (resourcePack) { %>
-            <div class="dynamicRow">
-              <input name="resourceName" placeholder="리소스팩 이름" value="<%= resourcePack.name %>" />
-              <input name="resourceUrl" placeholder="다운로드 URL" value="<%= resourcePack.downloadUrl %>" />
-              <button type="button" class="dangerLink dynamicRemove">삭제</button>
-            </div>
-          <% }) %>
-        </div>
-        <button type="button" class="secondaryButton" data-add="resourcepacks">리소스팩 추가</button>
-      </fieldset>
+      <div class="gridTwo">
+        <label>
+          <span>모드 폴더 이름</span>
+          <input name="modsFolder" value="<%= pack.modsFolder %>" placeholder="my-pack" pattern="[a-zA-Z0-9_\-]*" />
+          <small class="muted">/file/mods/&lt;폴더이름&gt;/ 안의 모든 .jar을 자동으로 받습니다. 비워두면 모드를 받지 않습니다.</small>
+        </label>
+        <label>
+          <span>리소스팩 (.zip)</span>
+          <input name="resourcepackPath" value="<%= pack.resourcepackPath %>" placeholder="my-pack.zip" pattern=".*\.zip|" />
+          <small class="muted">/file/resourcepacks/ 아래 .zip 파일 이름. 비워두면 리소스팩을 받지 않습니다.</small>
+        </label>
+      </div>
 
       <button class="primaryButton" type="submit">저장</button>
     </form>
@@ -129,32 +114,6 @@
       platformSelect.addEventListener('change', syncPlatformVisibility)
       syncPlatformVisibility()
 
-      document.querySelectorAll('[data-add]').forEach(function (button) {
-        button.addEventListener('click', function () {
-          var listKey = button.getAttribute('data-add')
-          var list = document.querySelector('[data-list="' + listKey + '"]')
-          if (!list) return
-          var nameField = listKey === 'mods' ? 'modName' : 'resourceName'
-          var urlField = listKey === 'mods' ? 'modUrl' : 'resourceUrl'
-          var placeholder = listKey === 'mods' ? '모드 이름' : '리소스팩 이름'
-          var row = document.createElement('div')
-          row.className = 'dynamicRow'
-          row.innerHTML =
-            '<input name="' + nameField + '" placeholder="' + placeholder + '" />' +
-            '<input name="' + urlField + '" placeholder="다운로드 URL" />' +
-            '<button type="button" class="dangerLink dynamicRemove">삭제</button>'
-          list.appendChild(row)
-        })
-      })
-
-      document.addEventListener('click', function (event) {
-        var target = event.target
-        if (!(target instanceof HTMLElement)) return
-        if (!target.classList.contains('dynamicRemove')) return
-        var row = target.closest('.dynamicRow')
-        if (row) row.remove()
-      })
-
       var form = document.getElementById('editorForm')
       form.addEventListener('submit', function (event) {
         var clientMin = Number(form.clientMinRam.value)