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/stage4.txt

@@ -0,0 +1,60 @@
+/
+   [ ] target exists
+   [ ] source /dev/disk/by-uuid/40a4098d-5a98-4584-b31a-07965d4a7969 exists
+   [ ] FS type is ext4
+/boot/efi
+   [ ] target exists
+   [ ] source /dev/disk/by-uuid/7B42-65C0 exists
+   [ ] FS type is vfat
+none
+   [W] non-bind mount source /swap.img is a directory or regular file
+   [ ] FS type is swap
+/mnt/banshee/4tb
+   [ ] target exists
+   [ ] userspace options: nofail,x-systemd.device-timeout=30
+   [ ] UUID=9c44b3c3-22dd-4de7-a920-f3f010bf1a34 translated to /dev/sda1
+   [ ] source /dev/sda1 exists
+   [ ] FS type is ext4
+/mnt/banshee/8a
+   [ ] target exists
+   [ ] userspace options: nofail,x-systemd.device-timeout=30
+   [ ] UUID=e323aabb-b80d-4a15-9bfd-1b26d95d305a translated to /dev/sdb1
+   [ ] source /dev/sdb1 exists
+   [ ] FS type is ext4
+/mnt/banshee/8b
+   [ ] target exists
+   [ ] userspace options: nofail,x-systemd.device-timeout=30
+   [ ] UUID=9bf4b3cb-7c9f-4ad4-bf97-20120c0aa42a translated to /dev/sdc1
+   [ ] source /dev/sdc1 exists
+   [ ] FS type is ext4
+/mnt/banshee/6tb
+   [ ] target exists
+   [ ] userspace options: nofail,x-systemd.device-timeout=30
+   [ ] UUID=5a6f50ac-a214-4807-8382-7c3bc908d5c1 translated to /dev/sdd1
+   [ ] source /dev/sdd1 exists
+   [ ] FS type is ext4
+/storage
+   [ ] target exists
+   [ ] FS options: allow_other,cache.files=off,category.create=pfrd,func.getattr=newest,dropcacheonclose=false,minfreespace=50G,moveonenospc=pfrd,branches-mount-timeout=30,branches-mount-timeout-fail=true,fsname=banshee
+   [W] unreachable source: /mnt/banshee/4tb:/mnt/banshee/8a:/mnt/banshee/8b:/mnt/banshee/6tb: No such file or directory
+   [W] mergerfs seems unsupported by the current kernel
+   [W] cannot detect on-disk filesystem type (No such file or directory)
+
+=== 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 ===
+
+Filesystem     Type  Size  Used Avail Use% Mounted on
+/dev/sda1      ext4  3.6T   28K  3.6T   1% /mnt/banshee/4tb
+/dev/sdb1      ext4  7.3T   28K  7.3T   1% /mnt/banshee/8a
+/dev/sdc1      ext4  7.3T   28K  7.3T   1% /mnt/banshee/8b
+/dev/sdd1      ext4  5.5T   28K  5.5T   1% /mnt/banshee/6tb
+/dev/sde2      ext4  218G   82G  126G  40% /