Just tell the CM manning the booth that you are there for dinner. He may or may not issue you a two hour parking pass. Regardless, WDW has no problem with people shopping, dining, or just checking their resorts out and will let you park for a couple hours for free. What you can not do, is park at a resort and then go to a park, to get out of paying the parking fee charged at the parks. Resort parking are for people using the amenities of that resort. You can't use their pool, but are welcome to shop, eat, and just look around.