fix: use rust blowfish instead of node

The JavaScript blowfish-node library had a critical bug where it would
sometimes return 2047 bytes instead of 2048 during decryption, causing
byte alignment issues that corrupted FLAC audio at specific intervals
(~every 32/82 seconds).

Changes:
- Add Rust dependencies: blowfish, md5, byteorder
- Implement new module in Rust with proper Blowfish CBC
- Add decryption Tauri command
- Update frontend to call Rust decryption instead of JavaScript
- Remove buggy JavaScript blowfish implementation
- Update decryption algorithm (6144-byte windows)

package.json

@@ -22,7 +22,6 @@
     "@tauri-apps/plugin-process": "~2",
     "@tauri-apps/plugin-sql": "^2.3.0",
     "@tauri-apps/plugin-store": "~2",
-    "blowfish-node": "^1.1.4",
     "music-metadata": "^11.9.0",
     "uuid": "^13.0.0"
   },