refactor: consolidate deployment documentation and cleanup repository

- Merge all deployment docs into single comprehensive DEPLOYMENT_GUIDE.md
- Add instructions for non-nginx deployment options
- Reference utility scripts in deployment guide
- Remove orphaned migrations folder at root level
- Remove redundant deployment documentation files
- Keep all utility scripts in scripts/ folder
- Update CLAUDE.md to reference new deployment guide

This provides a single source of truth for all deployment scenarios.

.gitignore

@@ -59,4 +59,11 @@ test-archiver/
 !data/.gitkeep
 !logs/.gitkeep
 
-PRODUCTION_DEPLOYMENT_GUIDE.md
+# development files
+backend/.swarm/
+.claudedocs/
+backend/data/
+logs/
+storage/
+data/
+certbot/