My questions are:
1. Can I use SVI on VSS enabled switches?
YES, you care create them, since VSS make 2 physical devices to one logical switch.
2. How can I use modules which are installed on both of switches? Are all the line-cards of both switches usable simultaneously? Or just active switch line-cards are usable and the standby switch line-cards become active when active switch fails?
it all depends in edge switch connection, if you have access swith with dual home connection make it port-channel, you have always have resilience in the setup ( again it all depends on how you design edge network, L2 or L3)
here is the design guide for reference :
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