docs: add licensing programme specs
Seven specs covering the licensing and billing programme:
- 0a shared-module: extract shared Go module, remove sitesvc duplication
- 0b instance-rename: Org -> Instance, including the database field
- 1 licensing-core: lk-signed licence payload, offline verify, CLI issuer
- 2 instance-licensing: storage, enforcement, degraded mode, settings UI
- 3 admin-backend: accounts, instances, licences, subscriptions, injection
- 4 admin-site: staff and customer portal
- 5 paddle-billing: catalog, checkout, webhooks, signup migration
Design only. No implementation.
Un-ignores docs/superpowers/ so specs are versioned.
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