Remove obsolete torrent Kotlin files and fix CI build

- Deleted TorrentMetadataService.kt (obsolete, uses direct libtorrent4j)
- Deleted TorrentDisplayUtils.kt (obsolete utility, not used)
- Deleted TorrentModels.kt (obsolete models, replaced by torrentengine module)
- Add local.properties creation in build:torrent-engine job
- Fixes 'Unresolved reference: libtorrent4j' compilation errors
- Torrent functionality now fully in torrentengine module

.gitlab-ci.yml

@@ -19,6 +19,8 @@ cache:
 build:torrent-engine:
   stage: build
   image: mingc/android-build-box:latest
+  before_script:
+    - echo "sdk.dir=${ANDROID_SDK_ROOT:-/opt/android-sdk}" > android/local.properties
   script:
     - cd android
     - chmod +x gradlew