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/NORMALIZED-DATABASE-IMPLEMENTATION-PLAN.md

@@ -1083,10 +1083,10 @@ const object: CMDBObject = {
      - `routes/cache.ts`
    - Easy to replace all at once
 
-4. **Separate Database**
-   - Classifications database (`database.ts`) is separate
-   - Won't be affected by changes
-   - No risk to existing data
+4. **Classifications Database**
+   - Classifications database (`database.ts`) uses the same database as the cache
+   - All data (CMDB cache, classification history, session state) in one database
+   - Won't be affected by cache changes regardless
 
 5. **Rollback Plan**
    - Old code in git history