feat(billing): move plan writes to AdminService and add ListAllPlans

[rohilsurana]

What

Wire the frontier side of the plan admin APIs from raystack/proton#496.

• Move CreatePlan and UpdatePlan to AdminService (super user only). They were on FrontierService before.
• Add ListAllPlans on AdminService. It lists every plan, including disabled ones. An empty state returns all plans; a set state filters to it.
• CreatePlan now carries the plan state. UpdatePlan is implemented (it returned Unimplemented before) and does a full write of a plan's own fields (title, description, credits, trial days, state, metadata). A plan's products are still managed through CreatePlan's upsert.
• ListPlans and GetPlan stay on FrontierService and are unchanged.

How

• Pin proton to the branch commit that carries these proto changes and regenerate.
• The same ConnectHandler serves both services, so the existing CreatePlan method now satisfies AdminService. UpdatePlan and ListAllPlans are added to it.
• The authz interceptor gates the three AdminService plan RPCs behind IsSuperUser, and the old FrontierService plan entries are removed. Any endpoint not listed is denied by default, so these entries are required.
• ListAllPlans passes a plan.StateAll sentinel to the repository so an empty state lists plans in every state. The repository still defaults an empty state to active for ListPlans, which lists active plans only.

Depends on

• feat(frontier)!: move CreatePlan and UpdatePlan to AdminService and add ListAllPlans proton#496 (the pinned commit). Rebase the pin to a merged proton commit before this lands.

Testing

• New handler tests for UpdatePlan and ListAllPlans. Existing plan handler and service tests pass.
• The e2e billing tests now call CreatePlan on the admin client.
• build, vet, gofmt, and golangci-lint are green.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
frontier	Ready	Preview	Jul 31, 2026 10:27am

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