i18n: 서버 측 모든 UI 문구를 locales/server/ko-kr.json 으로 분리

- src/shared/i18n.ts: 공용 i18n 로더 (dotted-key + {{placeholder}} 보간)
- locales/server/ko-kr.json: 사이트 + 라우터 + 데이터팩 출력 사전
- EJS 뷰는 res.locals.t 미들웨어로 일괄 적용
- listEditor.js 등 클라이언트 JS 는 사전을 inline <script> 로 주입받아 tt() 헬퍼 사용

src/server/routes/op.ts

@@ -16,6 +16,7 @@ import { fetchReleaseVersions } from '../../shared/mojang.js'
 import { fetchPlaylistEntries, fetchVideoMeta, YtDlpUnavailableError } from '../youtube.js'
 import { requireAuth } from '../middleware/auth.js'
 import type { PackDefinition, PackList } from '../../shared/types.js'
+import { t } from '../i18n.js'
 
 export const opRouter = Router()
 
@@ -46,7 +47,7 @@ opRouter.post('/op', async (req, res, next) => {
     const accounts = await readAccounts()
     const matched = accounts.find((entry) => entry.password === password)
     if (!matched) {
-      res.status(401).render('op/login', { error: '비밀번호가 올바르지 않습니다.' })
+      res.status(401).render('op/login', { error: t('login.wrongPassword') })
       return
     }
     req.session.userId = matched.id
@@ -106,7 +107,7 @@ opRouter.get('/op/dashboard/:packName', requireAuth, async (req, res, next) => {
     const packKey = sanitizePackKey(pickFirstValue(req.params.packName))
     const definition = await loadPackDefinition(packKey)
     if (!definition) {
-      res.status(404).send('해당 음악퀴즈를 찾을 수 없습니다.')
+      res.status(404).send(t('errors.packNotFound'))
       return
     }
     const releases = await fetchReleaseVersions()
@@ -142,7 +143,7 @@ opRouter.get('/op/list/:packName', requireAuth, async (req, res, next) => {
     const packKey = sanitizePackKey(pickFirstValue(req.params.packName))
     const definition = await loadPackDefinition(packKey)
     if (!definition) {
-      res.status(404).send('해당 음악퀴즈를 찾을 수 없습니다.')
+      res.status(404).send(t('errors.packNotFound'))
       return
     }
     const list = await loadPackList(packKey)
@@ -163,7 +164,7 @@ opRouter.post('/op/list/:packName', requireAuth, async (req, res, next) => {
     const packKey = sanitizePackKey(pickFirstValue(req.params.packName))
     const definition = await loadPackDefinition(packKey)
     if (!definition) {
-      res.status(404).json({ ok: false, message: '음악퀴즈를 찾을 수 없습니다.' })
+      res.status(404).json({ ok: false, message: t('errors.packNotFoundJson') })
       return
     }
     const normalized = normalizePackList(req.body)
@@ -179,13 +180,13 @@ opRouter.post('/op/list/:packName', requireAuth, async (req, res, next) => {
 opRouter.post('/op/list/:packName/video-meta', requireAuth, async (req, res) => {
   const url = pickFirstValue(req.body?.url).trim()
   if (!url) {
-    res.status(400).json({ ok: false, message: '영상 주소를 입력해 주세요.' })
+    res.status(400).json({ ok: false, message: t('errors.videoUrlRequired') })
     return
   }
   try {
     const entry = await fetchVideoMeta(url)
     if (!entry) {
-      res.status(404).json({ ok: false, message: '메타데이터를 찾을 수 없습니다.' })
+      res.status(404).json({ ok: false, message: t('errors.metaNotFound') })
       return
     }
     res.json({ ok: true, entry })
@@ -203,7 +204,7 @@ opRouter.post('/op/list/:packName/video-meta', requireAuth, async (req, res) =>
 opRouter.post('/op/list/:packName/playlist', requireAuth, async (req, res) => {
   const url = pickFirstValue(req.body?.url).trim()
   if (!url) {
-    res.status(400).json({ ok: false, message: '플레이리스트 주소를 입력해 주세요.' })
+    res.status(400).json({ ok: false, message: t('errors.playlistUrlRequired') })
     return
   }
   try {
@@ -238,19 +239,27 @@ opRouter.get('/op/datapack/:packName/generate', requireAuth, async (req, res, ne
     const packKey = sanitizePackKey(pickFirstValue(req.params.packName))
     const definition = await loadPackDefinition(packKey)
     if (!definition) {
-      res.status(404).type('text/plain').send('음악퀴즈를 찾을 수 없습니다.')
+      res.status(404).type('text/plain').send(t('errors.packNotFoundJson'))
       return
     }
     const list = await loadPackList(packKey)
     const lines: string[] = []
-    lines.push(`# === musicquiz: ${definition.name} ===`)
-    lines.push(`# 총 ${list.music.length}곡 / 사진 ${list.images.length}장`)
-    lines.push(`say [musicquiz] 데이터팩 초기화`)
-    lines.push(`# 곡별 placeholder. 실제 포맷 확정되면 교체 예정.`)
+    lines.push(t('datapackOutput.header', { name: definition.name }))
+    lines.push(t('datapackOutput.summary', {
+      musicCount: list.music.length,
+      imageCount: list.images.length
+    }))
+    lines.push(t('datapackOutput.initLine'))
+    lines.push(t('datapackOutput.placeholder'))
     list.music.forEach((entry, index) => {
-      const title = entry.title || '(제목 없음)'
-      const artist = entry.artist || '(가수 미상)'
-      lines.push(`# ${index + 1}. ${title} - ${artist} (${entry.durationSec}s)`)
+      const title = entry.title || t('datapackOutput.titleFallback')
+      const artist = entry.artist || t('datapackOutput.artistFallback')
+      lines.push(t('datapackOutput.trackLine', {
+        index: index + 1,
+        title,
+        artist,
+        duration: entry.durationSec
+      }))
     })
     res.type('text/plain; charset=utf-8').send(lines.join('\n') + '\n')
   } catch (error) {
@@ -287,7 +296,7 @@ opRouter.post('/op/dashboard/:packName', requireAuth, async (req, res, next) =>
 
     const normalized = normalizePackDefinition(partial)
     if (normalized.clientMinRam > normalized.clientRecommendedRam) {
-      res.status(400).send('clientMinRam은 clientRecommendedRam보다 클 수 없습니다.')
+      res.status(400).send(t('errors.ramOrderInvalid'))
       return
     }
     const finalKey = await renamePack(packKey, requestedKey, normalized)