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>

stacks/README.md

@@ -22,13 +22,7 @@ review the http://core-api/docs openapi documentation for infrastructure managem
 |-------|------|-------|-----|-------------|
 | **Headscale** | `headscale.yml` | 8085, 9090 | No | Self-hosted Tailscale control server |
 
-### Phase 3: Monitoring
-
-| Stack | File | Ports | GPU | Description |
-|-------|------|-------|-----|-------------|
-| **Netdata** | `netdata.yml` | 19999 | No | Real-time system performance monitoring |
-
-### Phase 4: Optimization
+### Phase 3: Optimization
 
 | Stack | File | Ports | GPU | Description |
 |-------|------|-------|-----|-------------|
@@ -62,9 +56,8 @@ review the http://core-api/docs openapi documentation for infrastructure managem
 - 2222: Gitea SSH
 - 3002: Gitea HTTP
 
-### Monitoring Services (19000-19999)
+### Backup Services
 - 8200: Duplicati
-- 19999: Netdata
 
 ### ML/API Services (11000+)
 - 11434: Ollama