Build resource pack zip and drop it into .minecraft

Add archiver dep (v7 — v8 dropped the function-style default export
that the @types still describe) and a new src/installer-rp/pack.ts
that assembles the resource pack tree under tempDir/resourcepack/
and zips it to %appdata%/.minecraft/resourcepacks/<key>_musicquiz.zip.

The tree matches Minecraft 1.21+ painting variant + custom sound
conventions:

  pack.mcmeta                                           pack_format 34,
                                                        supported 34..75
  assets/musicquiz/sounds.json                          stream:true per track
  assets/musicquiz/sounds/track_NN.ogg                  from tempDir/music
  assets/musicquiz/textures/painting/cover_NN.png       from tempDir/painting

Music NN.ogg is renamed to track_NN.ogg at copy time so the sound
event ids stay readable. The painting_variant JSON definitions are
intentionally NOT generated here — those live in the data pack and
are owned by /op/datapack on the website.

Wire step 2-4 of the install IPC to call buildResourcepackZip with
the now-populated music/painting temp dirs. Step 2-5 is now just a
log line since buildResourcepackZip writes directly to the final
path.

Verified by a node smoke test: tempDir of two stub ogg files plus
two 256x256 PNGs produces a valid zip with the expected entries
and UTF-8 Korean strings in pack.mcmeta description.

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

src/installer-rp/main.ts

@@ -13,6 +13,7 @@ import { ensureYtDlpExe } from './ytdlp.js'
 import { ensureFfmpegExe } from './ffmpeg.js'
 import { downloadMusicTrack } from './music.js'
 import { downloadImage, normalizeToCover, coverFileName } from './images.js'
+import { buildResourcepackZip } from './pack.js'
 
 interface RpInstallerState {
   manifestUrl: string
@@ -211,18 +212,21 @@ ipcMain.handle('rp:install:start', async (): Promise<{ resourcepackPath: string
       sendLog(`${i + 1}번 사진 완료: ${path.basename(outPath)}`)
     }
 
-    // 2-4. 리소스팩 zip 빌드
-    sendLog('리소스팩 zip 빌드 중… (TODO)')
+    // 2-4. 리소스팩 zip 빌드 (pack.mcmeta + sounds.json + 음악·이미지)
     throwIfCancelled()
-
-    // 2-5. %appdata%/.minecraft/resourcepacks/ 에 배치
     const resourcepackName = `${state.selectedKey}_musicquiz.zip`
     const resourcepackDir = path.join(getAppDataDir(), '.minecraft', 'resourcepacks')
-    await fsp.mkdir(resourcepackDir, { recursive: true })
     const resourcepackPath = path.join(resourcepackDir, resourcepackName)
-    // TODO: 실제 zip 파일을 위치시킴. 지금은 빈 placeholder.
-    await fsp.writeFile(resourcepackPath, '', { flag: 'a' })
+    sendLog(`리소스팩 zip 빌드 중… (${resourcepackName})`)
+    await buildResourcepackZip({
+      musicDir,
+      paintingDir,
+      packName: pack.name,
+      workDir: tempRoot,
+      outZipPath: resourcepackPath
+    })
 
+    // 2-5. %appdata%/.minecraft/resourcepacks/ 에 배치 (위 빌드가 직접 outZipPath 에 저장)
     sendLog(`설치 완료: ${resourcepackPath}`)
     return { resourcepackPath }
   } finally {