docs(demo): synchronize all documentation with 16-service stack

Fix all documentation to match the actual running stack. Every service
count, port number, credential, network name, container name, and
dependency is now accurate across all files.

Key changes:
- Remove all stale Portainer/portainer references (replaced by Dockhand)
- Fix project name from tsysdevstack to kneldevstack everywhere
- Fix volume name pattern (underscore not dash after project name)
- Fix network names (add -network suffix, correct subnet in commands)
- Fix Homepage category from Infrastructure to Developer Tools
- Add companion services (ta-redis, ta-elasticsearch) to all service lists
- Fix Dockhand dependency description (direct socket, not proxy)
- Remove port 4005 from all host-facing health check loops and port tables
- Fix broken commands (docker exec dockhand docker version, wrong volume globs)
- Fix INFLUXDB_ADMIN_USER credential references from demo_admin to admin
- Fix Grafana datasource user to match
- Fix misleading "ports 4000-4018" range to explicit port list
- Add Docker Socket Proxy internal-only notes where applicable
- Update root AGENTS.md service categories to match compose labels

💘 Generated with Crush

Assisted-by: GLM-5.1 via Crush <crush@charm.land>

demo/docs/service-guides/README.md

@@ -33,7 +33,7 @@ All services are accessible through the Homepage dashboard at http://localhost:4
 - **Homepage** (Port 4000): Central dashboard for service discovery
 - **Atomic Tracker** (Port 4012): Habit tracking and personal dashboard
 - **ArchiveBox** (Port 4013): Web archiving solution
-- **Tube Archivist** (Port 4014): YouTube video archiving
+- **Tube Archivist** (Port 4014): YouTube video archiving (requires internal ta-redis + ta-elasticsearch)
 - **Wakapi** (Port 4015): Open-source WakaTime alternative
 - **MailHog** (Port 4017): Web and API based SMTP testing
 - **Atuin** (Port 4018): Magical shell history synchronization