rp-pack: never overwrite base resourcepack sounds/paintings (v0.3.5)

If the base resourcepack already has audio files under
assets/musicquiz/sounds/ or entries in assets/musicquiz/sounds.json,
the build now PRESERVES them and skips any new track that would
collide. Same policy for painting textures: existing cover_*.png
in the base are not overwritten by new ones.

Per-track collision is logged so the user can see exactly what was
preserved and what was skipped. Summary counts (added / skipped)
are also logged.

Requested by 사금향: "기존에 있는걸 삭제하거나 이상하게 엎어쓰지
말것" — preserve base assets unconditionally.

locales/installer-rp/ko-kr.json

@@ -106,6 +106,12 @@
     "packFormatFallback": "pack_format = {{format}} (mcVersion \"{{version}}\" 매칭 실패, 최신 폴백)",
     "packFormatRange": "호환 범위 선언: pack_format {{min}} ~ {{max}} (supported_formats / min_format / max_format 모두 기록)",
     "soundsMerged": "기존 sounds.json 병합 ({{count}}개 항목)",
+    "tracksAdded": "음악 트랙 추가됨: {{count}}곡",
+    "trackCollisionSkipped": "베이스 리소스팩에 같은 트랙이 이미 있어 건너뜀: {{trackId}}",
+    "tracksCollisionSummary": "베이스 자산 보존을 위해 {{count}}개 트랙을 건너뜀: {{list}}",
+    "paintingsAdded": "사진 텍스처 추가됨: {{count}}장",
+    "paintingCollisionSkipped": "베이스 리소스팩에 같은 사진이 이미 있어 건너뜀: {{name}}",
+    "paintingsCollisionSummary": "베이스 자산 보존을 위해 {{count}}장 사진을 건너뜀: {{list}}",
     "ytdlpLine": "yt-dlp> {{line}}"
   },
   "progress": {