feat(grid-wallet-prod): live Grid API — real passkey auth, funding, and signed cash-out (Phase 2)#740

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07-21-feat_grid-wallet-prod_fork_grid-wallet-demo_as_the_production_demo_applightsparkdev/grid-api:07-21-feat_grid-wallet-prod_fork_grid-wallet-demo_as_the_production_demo_appfrom

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