Consolidate documentation and update backend services

- Reorganize docs into 'Core deployment guides' and 'Setup and configuration' subdirectories
- Consolidate redundant documentation files (ACR, pipelines, deployment guides)
- Add documentation consolidation plan
- Update backend database factory and logger services
- Update migration script and docker-compose configurations
- Add PostgreSQL setup script

docs/DATABASE-RECOMMENDATION.md

@@ -3,8 +3,9 @@
 ## Huidige Situatie
 
 De applicatie gebruikt momenteel **SQLite** via `better-sqlite3`:
-- **cmdb-cache.db**: ~20MB - CMDB object cache
-- **classifications.db**: Classification history
+- **cmdb-cache.db**: ~20MB - Alle data (CMDB object cache, classification history, session state)
+
+**Note:** All data (cache, classifications, session state) is stored in a single database file.
 
 ## Aanbeveling: PostgreSQL