fix(demo): correct docs, env config, and health checks for production readiness

- Fix DrawIO/Kroki health checks from wget to curl (DrawIO has no wget,
  Kroki /health endpoint unreliable with wget)
- Fix script paths in demo/AGENTS.md (./demo-test.sh → ./scripts/demo-test.sh)
- Fix script paths in demo/README.md (./demo-stack.sh → ./scripts/demo-stack.sh)
- Fix all service URLs from 192.168.3.6 to localhost in demo/README.md
- Fix hardcoded variable references to actual port values in demo/README.md
- Fix root AGENTS.md doc paths (docs/ → demo/docs/)
- Reorganize demo.env: group related vars, fix TA_HOST to container DNS,
  fix ES_JAVA_OPTS quoting, move service credentials with their configs
- Add CWD guidance note to troubleshooting guide
- Regenerate docker-compose.yml with corrected TA_HOST

All 16 services healthy, 38/38 tests passing.

💘 Generated with Crush

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

demo/docs/troubleshooting/README.md

@@ -1,5 +1,7 @@
 # TSYS Developer Support Stack - Troubleshooting Guide
 
+> **Note:** All commands in this guide assume your working directory is the `demo/` folder of the repository. Run `cd demo` first if needed.
+
 ## Common Issues and Solutions
 
 ### Services Not Starting