feat: 🚀 Initialize TSYS Developer Support Stack demo environment

- Add comprehensive Docker Compose configuration with 16 developer services
- Configure Homepage dashboard with service discovery and grouping
- Set up environment configuration for demo deployment
- Include project documentation (PRD, README, User Guide, Agent guidelines)
- Establish foundation for developer tooling stack with proper networking and security

Services include developer tools (Homepage, Atuin, Wakapi, ArchiveBox, Tube Archivist, MailHog),
infrastructure (PostgreSQL, Elasticsearch, Redis, Docker Socket Proxy),
monitoring (InfluxDB, Grafana), and documentation (Draw.io, Kroki).

SupportStack/demo/homepage-settings.yaml

@@ -0,0 +1,22 @@
+---
+title: TSYS Developer Stack
+theme: dark
+color: slate
+
+quicklinks:
+  - name: Documentation
+    icon: mdi-book-open-variant
+    url: https://github.com/gethomepage/homepage
+  - name: GitHub Repository
+    icon: mdi-github
+    url: https://github.com/your-org/TSYSDevStack
+
+widgets:
+  - search:
+      provider: duckduckgo
+      target: _blank
+  - datetime:
+      text_size: xl
+      format:
+        dateStyle: long
+        timeStyle: short