feat(demo): add complete TSYS developer support stack demo implementation

Add full demo environment with 13 services across 4 categories:
- Infrastructure: Homepage, Docker Socket Proxy, Pi-hole, Portainer
- Monitoring: InfluxDB, Grafana
- Documentation: Draw.io, Kroki
- Developer Tools: Atomic Tracker, ArchiveBox, Tube Archivist,
  Wakapi, MailHog, Atuin

Includes:
- Docker Compose templates with dynamic environment configuration
- Deployment orchestration scripts with user ID detection
- Comprehensive test suite (unit, integration, e2e)
- Pre-deployment validation with yamllint, shellcheck
- Full documentation (PRD, AGENTS, README)
- Service configurations for all components

All services configured for demo purposes with:
- Dynamic UID/GID mapping
- Docker socket proxy security
- Health checks and monitoring
- Service discovery via Homepage labels

Ports allocated 4000-4099 range with sequential assignment.

💘 Generated with Crush

Assisted-by: GLM-4.7 via Crush <crush@charm.land>

demo/docs/service-guides/README.md

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+# TSYS Developer Support Stack - Service Guides
+
+This directory contains detailed guides for each service in the stack.
+
+## Available Guides
+
+- [Homepage Dashboard](homepage.md)
+- [Infrastructure Services](infrastructure.md)
+- [Monitoring & Observability](monitoring.md)
+- [Documentation & Diagramming](documentation.md)
+- [Developer Tools](developer-tools.md)
+
+## Quick Access
+
+All services are accessible through the Homepage dashboard at http://localhost:4000
+
+## Service Categories
+
+### 🏗️ Infrastructure Services
+- **Pi-hole** (Port 4006): DNS management with ad blocking
+- **Portainer** (Port 4007): Web-based container management
+- **Docker Socket Proxy** (Port 4005): Secure Docker socket access
+
+### 📊 Monitoring & Observability
+- **InfluxDB** (Port 4008): Time series database for metrics
+- **Grafana** (Port 4009): Analytics and visualization platform
+
+### 📚 Documentation & Diagramming
+- **Draw.io** (Port 4010): Web-based diagramming application
+- **Kroki** (Port 4011): Diagrams as a service
+
+### 🛠️ Developer Tools
+- **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
+- **Wakapi** (Port 4015): Open-source WakaTime alternative
+- **MailHog** (Port 4017): Web and API based SMTP testing
+- **Atuin** (Port 4018): Magical shell history synchronization
+
+## Demo Credentials
+
+⚠️ **FOR DEMONSTRATION PURPOSES ONLY**
+
+- **Username**: `admin`
+- **Password**: `demo_password`
+
+These credentials work for Grafana and Portainer. Other services may have different authentication requirements.
+
+## Getting Help
+
+1. Check the individual service guides below
+2. Review the [troubleshooting guide](../troubleshooting/README.md)
+3. Check service logs: `docker compose logs [service-name]`
+4. Verify service status: `docker compose ps`