Enhance backup system with comprehensive scripts and documentation

Database Backup Scripts:
- Add db-dump--standalone.sh for online database dumps (no downtime)
- Add db-restore-from-dump--standalone.sh for restoring from dumps
- Rename backup scripts with double-dash convention for clarity
- Add comprehensive header comments to all backup/restore scripts
- Document online vs offline, standalone vs swarm deployment types
- Add KEEP variable default (7) to dump script for rotation

Docker Configuration:
- Add mongo-backup volume mount to docker-compose-standalone.yaml
- Add mongo-backup volume mount to docker-compose-debug.yml
- Add container names to debug compose for consistency with standalone

Documentation:
- Add comprehensive Database Backup & Restore section to README.md
- Document all backup scripts with usage examples
- Document automated cron schedule (04:00 daily)
- Sunday: Full volume backup (KEEP=2, offline)
- Monday-Saturday: Database dumps (KEEP=7, online)
- Document backup directories and log file locations

Git Configuration:
- Add mongo-backup/ to .gitignore
- Fix missing newline at end of .gitignore

File Cleanup:
- Remove db-scheduled-backup.sh (superseded by cron jobs)

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

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

docker-compose-debug.yml

@@ -4,6 +4,7 @@ version: "3.7"
 services:
   mongo:
     image: mongo:4.4.27
+    container_name: evidencija-rezija__mongo
     ulimits:
       nofile:
         soft: 64000
@@ -16,8 +17,10 @@ services:
       MONGO_INITDB_ROOT_PASSWORD: HjktJCPWMBtM1ACrDaw7
     volumes:
       - ./mongo-volume:/data/db
+      - ./mongo-backup:/backup
   mongo-express:
     image: mongo-express
+    container_name: evidencija-rezija__mongo-express
     restart: always
     ports:
       - 8081:8081