wiki: add SELinux vmail and gitea-runner articles; update indexes

- New: SELinux Fixing Dovecot Mail Spool Context (/var/vmail)
  Corrected fix — mail_spool_t only, no dovecot_tmp_t on tmp/ dirs.
  Includes warning and recovery steps for the Postfix delivery outage.
- New: Gitea Actions Runner Boot Race Condition Fix
  network-online.target dependency, RestartSec=10, /etc/hosts workaround.
- Updated SUMMARY.md, index.md, README.md, 05-troubleshooting/index.md
- Article count: 37 → 39; MajorWiki-Deploy-Status updated

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

05-troubleshooting/index.md

@@ -13,8 +13,12 @@ Practical fixes for common Linux, networking, and application problems.
 
 ## 📦 Docker & Systems
 - [Docker & Caddy Recovery After Reboot (Fedora + SELinux)](docker-caddy-selinux-post-reboot-recovery.md)
+- [Gitea Actions Runner: Boot Race Condition Fix](gitea-runner-boot-race-network-target.md)
 - [MajorWiki Setup & Publishing Pipeline](majwiki-setup-and-pipeline.md)
 
+## 🔒 SELinux
+- [SELinux: Fixing Dovecot Mail Spool Context (/var/vmail)](selinux-dovecot-vmail-context.md)
+
 ## 📝 Application Specific
 - [Obsidian Vault Recovery — Loading Cache Hang](obsidian-cache-hang-recovery.md)
 - [Gemini CLI Manual Update](gemini-cli-manual-update.md)