Switch login to password-only and split pack zip paths

- Login form/route accepts password only; matched account row provides session userId
- PackDefinition: replace packPath with mapPath (.mc_custom/saves) and serverPath (server install dir); editor exposes two .zip fields
- Installer resolves relative platform/map/server URLs against manifest origin under /file/{platforms,maps,servers}/<name>; downloads and extracts the zips

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

views/op/editor.ejs

@@ -49,7 +49,8 @@
         </label>
         <label class="fullSpan" id="platformDownloadField">
           <span>플랫폼 설치파일 URL</span>
-          <input name="platformDownloadUrl" value="<%= pack.platform.downloadUrl || '' %>" placeholder="https://example.com/forge-installer.jar" />
+          <input name="platformDownloadUrl" value="<%= pack.platform.downloadUrl || '' %>" placeholder="/forge-installer.jar 또는 https://example.com/forge-installer.jar" />
+          <small class="muted">도메인 없이 입력하면 manifest.json 도메인의 <code>/file/platforms/&lt;파일명&gt;</code>으로 해석됩니다.</small>
         </label>
         <label>
           <span>서버 최소 램 (MB)</span>
@@ -67,9 +68,15 @@
           <span>클라이언트 권장 램 (MB)</span>
           <input type="number" name="clientRecommendedRam" value="<%= pack.clientRecommendedRam %>" min="512" required />
         </label>
-        <label class="fullSpan">
-          <span>packPath (서버 파일 경로, /file/ 이후만)</span>
-          <input name="packPath" value="<%= pack.packPath %>" placeholder="music-quiz/files" />
+        <label>
+          <span>맵 파일 (.zip)</span>
+          <input name="mapPath" value="<%= pack.mapPath %>" placeholder="my-map.zip" pattern=".+\.zip" />
+          <small class="muted">/file/maps/ 아래 zip 파일 이름.</small>
+        </label>
+        <label>
+          <span>서버 파일 (.zip)</span>
+          <input name="serverPath" value="<%= pack.serverPath %>" placeholder="my-server.zip" pattern=".+\.zip" />
+          <small class="muted">/file/servers/ 아래 zip 파일 이름. 멀티 모드 전용.</small>
         </label>
       </div>