fix(products): stop enforcing store rules the server owns

[joshdholtz]

The CLI was enforcing store rules it doesn't own — and they were already stale (the API creates and prices Web Billing and Test Store products; the CLI still said no). Now the server is the only authority. Three changes:

rc products create stops pre-blocking. Requests go through and the server's error answers, with a hint to what works today:

$ rc products create --app-id app_webbilling --store-id premium --type subscription --title Premium
  Web Billing products are created through store-state plans:  rc products store sync app_webbilling
✗ authorization_error: Web Billing product creation is still not supported.

rc products store accepts every store the plans API supports. No more Apple/Play-only gate, and the interactive flow uses the app's real store type instead of coercing everything to app_store.

Prices land in the shape the input implies, not what a store list dictates. A territory means territory_prices; no territory means currency_prices (how Web Billing and Test Store price — territory prices sent to them were silently ignored before). No hardcoded store list to go stale when the next store is ungated.

The only client-side errors left are structural — the payload can't be built without the field — and they carry CSV line numbers. Per-store type lists survive only in help text and the interactive picker.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR adjusts the CLI’s handling of store-specific “rules” (product creation/store-state eligibility) to avoid hard client-side blocks that can go stale as the server enables new capabilities, and instead defers final validation to the API while emitting warnings on stderr (including in --json mode).

Changes:

• Replace several client-side hard errors with AlwaysWarn warnings so requests still reach the server for authoritative validation.
• Add/update tests to assert unknown store/type combinations and Web Billing product creates warn but still post to the create endpoint.
• Add guidance hints for users when the operation is likely to be rejected server-side.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
internal/cli/products.go	Converts Web Billing and unknown store/type client-side blocks into warnings while still posting creates.
internal/cli/products_store.go	Changes store-state app-type validation from hard-stop to warning + hint, allowing server-side decision.
internal/cli/products_create_test.go	Updates tests/helpers to capture stderr and assert warnings occur without preventing requests.

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