Update .gitignore and refactor docker-compose.sh for improved host IP detection

- Added .host-ip to .gitignore to prevent tracking of host IP configurations.
- Enhanced docker-compose.sh to prioritize HOST_IP environment variable, fallback to .host-ip file, and finally auto-detect the host IP, improving robustness in various environments.
- Updated documentation to reflect changes in Supabase migration paths and removed references to deprecated management-dashboard-web-app directory.

.gitignore

@@ -6,6 +6,7 @@ __pycache__/
 .uv/
 .env
 .env.*.local
+.host-ip
 .pytest_cache/
 .mypy_cache/
 
@@ -35,5 +36,7 @@ management-dashboard-web-app/users.txt
 
 # Jupyter Notebooks
 *.ipynb
-management-dashboard-web-app/supabase/.temp/cli-latest
 supabase/.temp/cli-latest
+
+# Archive env backups (may contain secrets)
+archive/management-dashboard-web-app/env-backups/