feat(stripe-projects): add provisioning account endpoints
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Stacked on #10684 (provider backend foundation); followed by #10686 (resource provisioning) and #10687 (dashboard deep links).
Milestone 1 account/provider endpoints for the Stripe Projects APP provider.
createRoute conventionStill intentionally excludes resource provisioning, deep links, paid plans, SPT, rotate/remove, connected account resources, MCP resources, and generic external provisioning.
Local verification: SKIP_VALIDATION=true pnpm --dir apps/apollo check-types.