update version, fix bug / validate flash fw

utils/system.py

@@ -34,3 +34,11 @@ def get_machine_info():
         "os": os_info,
         "mac": mac_addr,
     }
+
+def get_version():
+    """Read version from version.txt"""
+    try:
+        with open(resource_path('version.txt'), 'r', encoding='utf-8') as f:
+            return f.read().strip()
+    except Exception:
+        return "Unknown"