Add Action-tab example conditioning inputs (FP8 parity)

Adds the action-demo conditioning INPUTS the WebUI Action 'Run demo' reads (agibotworld first-frame image for policy/forward_dynamics; av clips for inverse_dynamics), which the NVFP4 assets/ lacked vs the FP8 checkpoint. Weights/config unchanged. AM-S5 follow-up.

assets/example_action_id_av_0_input.mp4

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+size 1125838

assets/example_action_id_av_1_input.mp4

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+size 1639407