Sanitize codebase, reorganize docs, and add missing deploy files

Remove dead code identified in docs/SANITIZATION-REVIEW.md:
- app/blueprints/content_old.py and app/blueprints/playlist.py
- app/models/group.py, app/utils/nginx_config_reader.py
- orphaned templates (content_list, edit_content, upload_content,
  player_page) and the related group/Template references

Result: 6 blueprints, 82 routes, no dead modules or orphan templates.

Add files that deploy.sh and docker-entrypoint.sh already require but
which were never tracked:
- https_manager.py       (referenced by deploy.sh, migrate_network.sh,
                          docker-entrypoint.sh)
- Caddyfile.example      (seeded by deploy.sh; its absence aborts deploy)

Relocate generated Graphify artifacts from graphify-out/ to
docs/graphify-out/ (110 files, no content change) and archive the
superseded docs under docs/.

Ignore hygiene:
- ignore ad-hoc .env backups (.env.bak*) — they contain live secrets
- keep the pre-sanitization snapshots (docs/legacy code/,
  docs/old_code_documentation/) on disk but out of the repo

Fix .env.example: drop a duplicated config block, genericize the
hardcoded host IP, and document HOSTNAME_INTERNAL.

docs/graphify-out/COMPASS.md

@@ -0,0 +1,22 @@
+# Architectural Compass - /home/scheianu/digiserver-v2 (2026-08-16)
+
+> [!NOTE]
+> This is a token-optimized summary. For deep logic, see GRAPH_REPORT.md.
+
+## Core Abstractions (God Nodes)
+1. `log_action()` (116 edges)
+2. `PlayerEdit` (99 edges)
+3. `PlayerUser` (74 edges)
+4. `Playlist` (33 edges)
+5. `CaddyConfigGenerator` (31 edges)
+6. `HTTPSConfig` (30 edges)
+7. `Content` (24 edges)
+8. `User` (19 edges)
+9. `create_app()` (13 edges)
+10. `Models package for digiserver-v2.` (13 edges)
+
+## System Layers
+- **L0: Global/Entry**: 
+- **L1: Strategic/Core**: 
+- **L2: Implementation**: 
+- **L3: Utility**: