Namespace cache purge tags by environment

[timkelty]

Uses environment-first URI and CDN purge tags ({environmentId}:uri... and {environmentId}:cdn...) with the single {environmentId}:overflow fallback for overlong selectors and Craft tag-count overflow.

The package sends only these tags. Rollout legacy aliases remain a gateway concern and are documented here only as cache-entry formats.

Related: craftcms/cloud-gateway#176

[Copilot]

Pull request overview

This PR updates static cache purge behavior to include both legacy unnamespaced origin tags and the newer origin:{environmentId}-namespaced tags, while leaving CDN tag behavior unchanged. This keeps invalidation compatible across environments that may still rely on legacy tag formats.

Changes:

• Update origin purging (purgeOrigin() and element URI purging) to purge both legacy and origin:-namespaced tags.
• Add/adjust unit tests to assert the expanded set of purge tags in API payloads and header fallback behavior.
• Update StaticCache header/tag format documentation to reflect legacy vs origin: formats.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/StaticCache.php	Purges legacy origin tags alongside origin:{environmentId} (and URI variants), and updates tag format docs.
tests/unit/StaticCacheTest.php	Adds/updates assertions to ensure both legacy and origin: tags are included in purge flows and fallbacks.

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