Fix variable name conflict in admin config

- Rename 'flash' variable to 'flash_enabled' to avoid shadowing the flash() function
- Resolve TypeError when saving admin configuration

vidai/admin.py

@@ -357,8 +357,8 @@ def config():
         ffmpeg = request.form.get('ffmpeg') == 'on'
         set_ffmpeg(ffmpeg)
 
-        flash = request.form.get('flash') == 'on'
-        set_flash(flash)
+        flash_enabled = request.form.get('flash') == 'on'
+        set_flash(flash_enabled)
 
         # RunPod Settings
         runpod_enabled = request.form.get('runpod_enabled') == 'on'