Rimpotche I think there was (is?) addon that can save enabled add-ons per blend file, unfortunately i can’t find it.
But fear not, its very easy to just do it yourself via simple script:
You place this script into blender text editor (remember that name of script must end with “.py”) and check “Register”.
Save the blend file and whenever you load this blend file this script will be executed (and enable your addons).
Tip: module names are just addon filename without “.py” extension or addon catalog name.
Warning: This approach needs “Auto Run Python Scripts” to be enabled (in Preferences)