docs: document automated backup configuration

Updated documentation to reflect complete backup setup:

**CLAUDE.md Updates:**
- Added detailed repository configuration (hidrive-backup)
- Documented all 11 backup plans with schedules and retention
- Explained volume mounting strategy with prefixed names
- Added configuration management instructions
- Included maintenance schedule (weekly prune/check)

**README.md Updates:**
- Added "Backup Operations" section with CLI commands
- Documented automated backup schedule (2-8 AM daily)
- Added backup protocol to security section
- Updated mission status with backup system indicator
- Included next backup time and repository status

**compose.yaml Updates:**
- Restored backrest_config volume (needed for proper operation)
- Removed direct config.json mount (causes write conflicts)
- Config copied into volume after container start

All 11 backup plans now documented:
- postgres, redis, directus (uploads/bundle)
- awesome, gotify, scrapy, n8n
- filestash, linkwarden, letsencrypt

Retention policies range from 3-12 months with yearly backups
for critical data (postgres, directus, letsencrypt).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

README.md

@@ -152,6 +152,32 @@ arty uploads/import
 arty env/sync
 ```
 
+### Backup Operations (RESTIC System)
+
+```bash
+# Access backup web interface
+# URL: https://restic.pivoine.art
+# Username: valknar
+# Password: Set on first access
+
+# View backup status
+docker logs restic_app | grep scheduled
+
+# Manually trigger backup for a specific plan
+docker exec restic_app /backrest backup --plan postgres-backup
+
+# List all snapshots in repository
+docker exec restic_app restic -r /repos snapshots
+
+# Restore from backup (via web UI recommended)
+# Navigate to restic.pivoine.art → Browse snapshots → Restore files
+```
+
+**Automated Backup Schedule:**
+- Daily backups: 2 AM - 8 AM (staggered by service)
+- Weekly maintenance: Sundays at 2 AM (prune) and 3 AM (check)
+- All volumes backed up to: `/mnt/hidrive/users/valknar/Backup`
+
 ---
 
 ## 🌠 SHIP ARCHITECTURE
@@ -238,6 +264,15 @@ THE FALCON (falcon_network)
 ├─ HTTP Basic Auth on sensitive endpoints
 ├─ Rate limiting available (100 req/s)
 └─ VPN cloaking device enabled
+
+💾 BACKUP PROTOCOL
+├─ Automated daily backups (2-8 AM)
+├─ 11 backup plans covering all volumes
+├─ Retention: 7 daily, 4 weekly, 3-12 monthly
+├─ Encrypted restic repositories
+├─ Weekly maintenance (prune & integrity check)
+├─ Web UI for monitoring & restore
+└─ HiDrive remote storage
 ```
 
 ---
@@ -245,15 +280,20 @@ THE FALCON (falcon_network)
 ## 📊 MISSION STATUS
 
 ```
-╔═══════════════════════════════════════╗
-║  SHIP'S VITAL SIGNS                   ║
-╠═══════════════════════════════════════╣
-║  ✅ Core Systems      → OPERATIONAL   ║
-║  ✅ Shield Generator  → ONLINE        ║
-║  ✅ Database Vault    → SECURED       ║
-║  ✅ Cache Drive       → OPTIMIZED     ║
-║  🌟 Captain Status    → ON ADVENTURE  ║
-╚═══════════════════════════════════════╝
+╔════════════════════════════════════════╗
+║  SHIP'S VITAL SIGNS                    ║
+╠════════════════════════════════════════╣
+║  ✅ Core Systems       → OPERATIONAL   ║
+║  ✅ Shield Generator   → ONLINE        ║
+║  ✅ Database Vault     → SECURED       ║
+║  ✅ Cache Drive        → OPTIMIZED     ║
+║  ✅ Backup System      → AUTOMATED     ║
+║  🌟 Captain Status     → ON ADVENTURE  ║
+╚════════════════════════════════════════╝
+
+Next Backup: Tomorrow 2:00 AM (postgres-backup)
+Backup Target: /mnt/hidrive/users/valknar/Backup
+Repository Status: Initialized & Ready
 ```
 
 ---