wiki: audit fixes — broken links, wikilinks, frontmatter, stale content (66 files)

- Fixed 4 broken markdown links (bad relative paths in See Also sections)
- Corrected n8n port binding to 127.0.0.1:5678 (matches actual deployment)
- Updated SnapRAID article with actual majorhome paths (/majorRAID, disk1-3)
- Converted 67 Obsidian wikilinks to relative markdown links or plain text
- Added YAML frontmatter to 35 articles missing it entirely
- Completed frontmatter on 8 articles with missing fields

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

01-linux/storage/mdadm-raid-rebuild.md

@@ -109,5 +109,5 @@ Reference: [mdadm — How to rebuild RAID array after fresh install (Unix & Linu
 
 ## See Also
 
-- [[snapraid-mergerfs-setup]]
-- [[rsync-backup-patterns]]
+- [snapraid-mergerfs-setup](snapraid-mergerfs-setup.md)
+- [rsync-backup-patterns](../../02-selfhosting/storage-backup/rsync-backup-patterns.md)