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/sda-rescue.map

@@ -0,0 +1,11 @@
+# Mapfile. Created by GNU ddrescue version 1.27
+# Command line: ddrescue -f -n -R -O /dev/sdf /dev/sda /root/sda-rescue.map
+# Start time:   2026-09-06 16:19:08
+# Current time: 2026-09-06 16:57:25
+# Copying non-tried blocks... Pass 5 (backwards)
+# current_pos  current_status  current_pass
+0x9BCDFF0000     ?               5
+#      pos        size  status
+0x00000000  0x9BCDFF0000  ?
+0x9BCDFF0000  0x85207B0000  *
+0x120EE7A0000  0x28293036000  ?