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.

post-rebuild/mfs-good.txt

@@ -0,0 +1,20 @@
+=== BRANCHES ===
+TARGET           SOURCE    FSTYPE OPTIONS
+/mnt/banshee/4tb /dev/sda1 ext4   rw,relatime
+TARGET          SOURCE    FSTYPE OPTIONS
+/mnt/banshee/8a /dev/sdb1 ext4   rw,relatime
+TARGET          SOURCE    FSTYPE OPTIONS
+/mnt/banshee/8b /dev/sdc1 ext4   rw,relatime
+TARGET           SOURCE    FSTYPE OPTIONS
+/mnt/banshee/6tb /dev/sdd1 ext4   rw,relatime
+
+=== POOL ===
+TARGET   SOURCE  FSTYPE        OPTIONS
+/storage banshee fuse.mergerfs rw,relatime,user_id=0,group_id=0,default_permissions,allow_other
+
+Filesystem     Type           Size  Used Avail Use% Mounted on
+banshee        fuse.mergerfs   24T  112K   24T   1% /storage
+
+=== SYSTEMCTL CHECK ===
+Requires=system.slice -.mount mnt-banshee-6tb.mount mnt-banshee-8a.mount mnt-banshee-4tb.mount mnt-banshee-8b.mount
+After=mnt-banshee-4tb.mount mnt-banshee-8b.mount -.mount mnt-banshee-6tb.mount system.slice systemd-journald.socket mnt-banshee-8a.mount local-fs-pre.target