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>

02-selfhosting/security/fail2ban-apache-404-scanner-jail.md

@@ -1,3 +1,12 @@
+---
+title: "Fail2ban Custom Jail: Apache 404 Scanner Detection"
+domain: selfhosting
+category: security
+tags: [fail2ban, apache, security, scanner, firewall]
+status: published
+created: 2026-04-02
+updated: 2026-04-02
+---
 # Fail2ban Custom Jail: Apache 404 Scanner Detection
 
 ## The Problem