Update Development Workflow documentation, modify app configuration for Archipelago, and enhance deployment scripts

- Updated the Development-Workflow.mdc to clarify testing procedures for apps launching in iframes or new tabs.
- Changed Archipelago app configuration to use new credentials for RPC and database connections.
- Enhanced deployment scripts to improve handling of mempool-electrs and added support for NBXplorer in the BTCPay Server setup.

.cursor/rules/Development-Workflow.mdc

@@ -11,7 +11,11 @@ alwaysApply: true
 
 1. **Make the change** the user requests
 2. **SSH and build to live server** - Run `./scripts/deploy-to-target.sh --live` once done
-3. **Test that it works** - Verify apps launch and show their UI in a new browser tab on their server port (e.g. http://192.168.1.228:4080 for Mempool)
+3. **Test that it works** - Verify apps launch: iframe for most apps, new tab for BTCPay/Home Assistant
+
+## App Launcher (iframe + new tab fallback)
+
+Most apps launch in the iframe overlay. BTCPay (port 23000) and Home Assistant (port 8123) set `X-Frame-Options` and don't support subpath proxying—they open in a new tab instead.
 4. **If broken, fix and repeat** - Debug, fix, redeploy, and test again until complete
 5. **End loop** only when everything works