Some things might have changed since I quit flying 320 five years ago, I'll try to answer as far as I can remember. Corrections are welcome.
1. No stupid questions. No special trim computer. ELAC sends signals to hydraulic actuators of ailerons, elevators and stabilizers
2. Correct, regarding the hard protections. There just might be speed stability left.
3. Trim stops at mechanical stops and that's all there is to it.
4 & 5. Control deflection is proportional to stick displacement but link is still electrical, the only mechanical link is between rudder pedals and rudder actuator.
6. Direct law is invoked by lowering the gear.
7. It does in pitch, just as any other A/P.