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/start_dashboard.py

@@ -18,7 +18,7 @@ def main():
     print("ATOMIZER DASHBOARD LAUNCHER")
     print("="*60)
     print(f"\nStarting dashboard server...")
-    print(f"Dashboard will open at: http://localhost:5000")
+    print(f"Dashboard will open at: http://localhost:8080")
     print("\nPress Ctrl+C to stop the server")
     print("="*60)
 
@@ -28,7 +28,7 @@ def main():
     # Open browser after a short delay
     def open_browser():
         time.sleep(3)  # Wait for server to start
-        webbrowser.open('http://localhost:5000')
+        webbrowser.open('http://localhost:8080')
 
     import threading
     browser_thread = threading.Thread(target=open_browser, daemon=True)