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I'm not sure if anyone does carbon forks with internal dynamo cabling, I think you'd have to go custom.
Couldn't you just use really strong black cloth tape up the back/inside of the fork leg, could be made to look quite neat. Or more pro might be some di2 wire covers either up the inside or back of the fork leg
http://www.wiggle.co.uk/shimano-ultegra-6770-di2-cable-cover-sheath-for-sd50/
ah, of course
http://www.fatbirds.co.uk/18859/products/kinesis-dc37-cx-disc-cyclocross--touring--road-mudguard-fork.aspx?origin=pla&kwd=¤cy=GBP&gclid=CNeNpMbi9sgCFUgTwwodmCgJEQ