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Do the other power features work, like the door locks and windows? There is no over ride feature to get the seat back. The electric motors are direct drive. The fuse may have blown for the power features. Did you check the connectors under the seat do they appear to be intact and connected? Try jiggling the seat. Does the back of the seat recline or work at all?
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Do you have a volt meter or a 12 volt test light or some jumper wires to test a few things?
Your only other option is to disconnect the battery cable end for 5 minutes and see if it possible resets anything. This is a long long shot but it only takes a 10mm wrench to try. The other thing would be trying to unbolt the rear seat track bolts and the fronts if you can still reach them and try to twist the seat tracks to force the motor to try and jar it if it is stuck. The track cover just pop off and then a 14 mm socket or 9/19 in. will work. That is about all you can try with out some test equipment or jumper wires. I just double checked the wiring diagram and there is a separate fuse for the power seats. It is a 30 amp POWER SEAT fuse in the lower finish panel fuse box. Check it to make sure it is good. It may have popped when you maxed the seat all the way forward.
You are correct the other seat functions would not work I forgot you said that the other functions of the seat worked. If the seat goes up try to tap on the motors under the seat with a small hammer while holding the switch in the back position and see if you can jar them to work. They are about 3 to 4 inches long and are parallel to the front of the seat.
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