Rename App ID: com.blitzkriegfc.qbz → com.blitzfc.qbz

Changes:
- Renamed Flatpak manifest, desktop file, and AppStream metainfo
- Updated App ID in all metadata files
- Fixed MPRIS name: qbz_nix → qbz
- Added NAS support permissions: /mnt, /media, /run/media
- Updated CI workflow to use new filenames
- Updated tauri.conf.json bundle identifier

BREAKING CHANGE: Users will need to migrate data from old App ID directories
Data migration will be implemented in next commit

.github/workflows/release-flatpak.yml

@@ -89,8 +89,8 @@ jobs:
         run: |
           mkdir -p flatpak-build flatpak-repo dist
           flatpak-builder --user --force-clean --repo=flatpak-repo \
-            flatpak-build packaging/flatpak/com.blitzkriegfc.qbz.yml
-          flatpak build-bundle flatpak-repo dist/QBZ.flatpak com.blitzkriegfc.qbz
+            flatpak-build packaging/flatpak/com.blitzfc.qbz.yml
+          flatpak build-bundle flatpak-repo dist/QBZ.flatpak com.blitzfc.qbz
 
       - name: Upload Flatpak bundle
         uses: actions/upload-artifact@v4