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/rebuild-mfs-good

@@ -0,0 +1,18 @@
+echo '=== BRANCHES ==='
+findmnt /mnt/banshee/4tb
+findmnt /mnt/banshee/8a
+findmnt /mnt/banshee/8b
+findmnt /mnt/banshee/6tb
+
+echo
+echo '=== POOL ==='
+findmnt /storage
+
+echo
+df -hT /storage
+
+echo
+echo '=== SYSTEMCTL CHECK ==='
+systemctl show storage.mount \
+  -p Requires \
+  -p After