Add scripts and configuration files for mergerfs setup and testing

- Created backup files for wipefs on specific disk partitions.
- Added db-test script to verify metadata.db file integrity.
- Documented successful mergerfs branch and pool configurations in mfs-good.txt.
- Implemented mfs write test in mfs-test.txt.
- Included mergerfs version and device information in mfs.txt.
- Developed rebuild scripts for mergerfs stages, including verification and filesystem creation.
- Generated stage logs for each rebuild step to track disk and filesystem status.
- Added checks for systemd mount requirements and filesystem verification in stage4.

others/inventory

@@ -0,0 +1,14 @@
+lsblk -d -o NAME,SIZE,MODEL,SERIAL,WWN,TYPE
+
+echo
+echo '--- BY-ID ---'
+ls -l /dev/disk/by-id/ | grep -E 'wwn-|ata-|scsi-'
+
+echo
+echo '--- PVS ---'
+pvs -o pv_name,pv_uuid,vg_name,pv_size,pv_free
+
+echo
+echo '--- LVS ---'
+lvs -a -o lv_name,vg_name,lv_size,devices
+