ref(asset): add mimetype mapping to built-in image
ref(asset): add mimetype mapping to built-in image

stardazed/stardazed,stardazed/stardazed-tx,zenmumbler/libzm,stardazed/stardazed-tx,zenmumbler/libzm,zenmumbler/stardazed-tx,zenmumbler/stardazed-tx,stardazed/stardazed,zenmumbler/libzm,zenmumbler/stardazed-tx,zenmumbler/libzm,stardazed/stardazed-tx,zenmumbler/stardazed-tx