fix: Change dashboard port from 5000 to 8080 to avoid Siemens conflict

- Update Flask server to run on port 8080 instead of 5000
- Update frontend API_BASE URL to http://localhost:8080/api
- Update launcher script to open browser at port 8080
- Update README documentation with new port number

This resolves the port conflict with Siemens documentation server.

dashboard/frontend/app.js

@@ -1,6 +1,6 @@
 // Atomizer Dashboard - Frontend JavaScript
 
-const API_BASE = 'http://localhost:5000/api';
+const API_BASE = 'http://localhost:8080/api';
 let currentStudy = null;
 let charts = {
     progress: null,