Adds ability to download and upload backups. Addresses discussions/454 and issues/736

[Mikec78660]

Give the ability to import/export backups and changes naming to more closely resemble the other arr configuration saves. Notably adding the service name (huntarr) to make it easier to identify what service the backup belongs to and adding the version number and time stamp to avoid conflicts when two backups were made on the same day. As a warning before restoring from a upoaded backup the user must enter "UPLOAD" and are given the same warning as restoring from a local backup" Warning: This action will permanently overwrite your current database with the uploaded backup. All current data will be lost. Make sure you have a recent backup before proceeding. "

root@desktop:~/arr-backups# ls
bazarr_backup_v1.5.3_2025.10.11_20.36.14.zip
huntarr_backup_v8.2.10_2025-11-07_00-18-10.zip
huntarr_backup_v8.2.10_2025.11.07_07.25.13.zip
huntarr_backup_v8.2.10_2025.11.07_08.20.54.zip
huntarr_backup_v8.2.10_2025.11.07_08.21.00.zip
huntarr_pre_restore_backup_v8.2.10_2025.11.07_08.35.32.zip
lidarr_backup_v2.14.2.4786_2025.10.11_18.35.19.zip
prowlarr_backup_v1.35.1.5034_2025.10.11_20.28.31.zip
radarr_backup_v5.27.5.10198_2025.10.11_20.29.08.zip
readarr_backup_v0.4.17.2801_2025.10.12_01.32.33.zip
sonarr_backup_v4.0.15.2940_2025.10.11_20.29.29.zip