feat(stack): replace Organizr with Tatlock UI, remove Netdata

Remove Organizr dashboard and Netdata monitoring:
- Delete stacks/organizr.yml and stacks/netdata.yml
- Delete organizr-widgets/ directory and npm forward-auth config
- Remove organizr database references from postgres-shared docs

Promote Tatlock UI as primary dashboard:
- Move from port 8092 to 9999 (Organizr's port)
- Enable external access at home.schweitz.net
- Update all documentation references

Update service counts: 26 containers across 20 stacks

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Makefile

@@ -23,7 +23,7 @@ help:
 	@echo ""
 	@echo "Available Stacks:"
 	@echo "  - portainer, nginx-proxy-manager, ollama"
-	@echo "  - headscale, netdata"
+	@echo "  - headscale"
 	@echo "  - watchtower, maintenance"
 	@echo "  - jellyfin, nextcloud, samba"
 	@echo ""
@@ -109,7 +109,7 @@ update-%:
 # Setup directories
 setup-dirs:
 	@echo "Creating directory structure..."
-	@mkdir -p ~/docker-data/{portainer,nginx-proxy-manager,ollama,headscale,netdata,jellyfin,nextcloud,samba}
+	@mkdir -p ~/docker-data/{portainer,nginx-proxy-manager,ollama,headscale,jellyfin,nextcloud,samba}
 	@mkdir -p /mnt/media/{jellyfin,nextcloud,game-servers,backups,downloads}
 	@echo "✅ Directories created"
 	@echo ""
@@ -164,21 +164,9 @@ deploy-phase2:
 	@echo "  2. Create user: docker exec headscale headscale users create homelab"
 	@echo "  3. Generate key: docker exec headscale headscale preauthkeys create --user homelab"
 
-# Quick deploy - Phase 3 monitoring
+# Quick deploy - Phase 3 optimization
 deploy-phase3:
-	@echo "=== Deploying Phase 3: Monitoring ==="
-	@echo ""
-	@echo "Deploying Netdata..."
-	@make deploy-netdata
-	@echo ""
-	@echo "=== Phase 3 Complete ==="
-	@echo ""
-	@echo "Access monitoring:"
-	@echo "  Netdata:     http://localhost:19999"
-
-# Quick deploy - Phase 4 optimization
-deploy-phase4:
-	@echo "=== Deploying Phase 4: Optimization ==="
+	@echo "=== Deploying Phase 3: Optimization ==="
 	@echo ""
 	@echo "[1/2] Deploying Watchtower..."
 	@make deploy-watchtower