feat: Add 6 new Claude Code skills

Skills added:
- 🔐 Secret Scanner: Detect leaked credentials in codebases
- 🏛️ Git Archaeologist: Analyze git history, find bugs
- 💾 Backup Automator: Automated encrypted cloud backups
- 🌐 Domain Manager: Unified DNS management
- 🔒 SSL Guardian: Certificate automation and monitoring
- 📡 Log Sentinel: Log analysis and anomaly detection

All skills include:
- SKILL.md with trigger patterns
- README.md with documentation
- GLM 5 attribution and disclaimer

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

skills/backup-automator/SKILL.md

@@ -0,0 +1,41 @@
+---
+name: backup-automator
+description: Use this skill when the user asks to "setup backups", "automated backup", "backup to cloud", "backup database", "schedule backup", "encrypted backup", "backup to S3/B2", or mentions backing up data.
+version: 1.0.0
+---
+
+# Backup Automator Skill
+
+Sets up automated, encrypted backups to cloud storage with scheduling and retention policies.
+
+## What It Does
+
+1. **Scheduled Backups**: Automatic backup at defined intervals
+2. **Encryption**: AES-256 encryption for all backup data
+3. **Cloud Storage**: S3, Backblaze B2, SFTP
+4. **Retention Policies**: Keep daily/weekly/monthly backups
+5. **Database Support**: MySQL, PostgreSQL, MongoDB
+
+## Quick Start
+
+```bash
+# Install restic
+sudo apt install -y restic
+
+# Initialize repository
+restic init -r s3:s3.amazonaws.com/my-bucket
+
+# Backup files
+restic backup -r s3:bucket /home /var/www /etc
+
+# Apply retention
+restic forget -r s3:bucket --keep-daily 7 --keep-weekly 4 --prune
+```
+
+## Usage
+
+```
+"Setup automated backups to S3"
+"Backup my database to Backblaze B2"
+"Create encrypted backup schedule"
+```