What Would You Classify As Treason in Your Ideal State?

[Bärin]

I'd classify these things as treason, maybe others too.
- Interracial relationships (race mixing)
- Xenophilia, promoting alien cultures, ethnicities over your own
- Fraternizing with the enemy in any form
- Conversion to an alien religion like Islam or Judaism
- Anti-German propaganda

[Wulfram]

You have pretty much covered the essentials.
I'm sure there are many others, but I think I can piece together a few other important details that would qualify:

-Assasination or attempted assasination of a citizen-elect official of government.

-Intoxication from substances during performance of one's duties that are vital for the states health.

-Divulging of secrets privy to those in high command.

-Turning against ones own family.
The family is the civilian equivalent of government. If you turn against your family you turn against the health of the state.
The head of the family is the equivalent of the head of state.
The father, the mother, older brother or sister constitute a heirarchy that should be seen as no different than the citizen-elect government. An attack on your mother would be an attack on the state and should be severely punished, either by the head of the household or by the state itself, depending on the severity of the attack.
By teaching a younger member to respect the sanctity of their family you are in essence teaching them to also be respectful of the state.