installer-rp: rename fallback pack name musicquiz → resourcepack

Per user request: when outputPackName is empty, fall back to
`<packKey>_resourcepack` instead of `<packKey>_musicquiz`.

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

src/installer-rp/main.ts

@@ -400,9 +400,9 @@ ipcMain.handle('rp:install:start', async (): Promise<{ resourcepackPath: string
     // 2-5. 리소스팩 zip 빌드 (pack.mcmeta + sounds.json + 음악·이미지, 베이스 위에 얹기)
     throwIfCancelled()
     // 사이트에서 지정한 "생성되는 리소스팩 이름" 을 우선 사용. 비어있거나 sanitize
-    // 결과가 빈 문자열이면 `<packKey>_musicquiz` 로 폴백.
+    // 결과가 빈 문자열이면 `<packKey>_resourcepack` 로 폴백.
     const sanitizedOutputName = sanitizeOutputPackName(pack.outputPackName)
-    const resourcepackBaseName = sanitizedOutputName || `${state.selectedKey}_musicquiz`
+    const resourcepackBaseName = sanitizedOutputName || `${state.selectedKey}_resourcepack`
     const resourcepackName = `${resourcepackBaseName}.zip`
     const resourcepackDir = path.join(getMcCustomDir(), 'resourcepacks')
     const resourcepackPath = path.join(resourcepackDir, resourcepackName)