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

src-tauri/tauri.conf.json

@@ -2,7 +2,7 @@
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "QBZ",
   "version": "1.1.5",
-  "identifier": "com.blitzkriegfc.qbz",
+  "identifier": "com.blitzfc.qbz",
   "build": {
     "beforeDevCommand": "npm run dev",
     "devUrl": "http://localhost:1420",