[w3c/ServiceWorker] Fix: Align Cache API definitions with Storage spec (PR #1789)

This commit clarifies how the Cache API interacts with the underlying storage mechanism, resolving ambiguity that stemmed from previous specification language.

Key changes:
- Removes the direct association between "storage key" and "name to cache map".
- Defines "relevant name to cache map" as being retrieved via the `obtain a local storage bottle map` algorithm from the Storage specification, ensuring alignment.
- Updates the definition of `CacheStorage` to represent the `name to cache map` associated with its `environment settings object`, rather than the `origin`.

This makes the relationship between the ServiceWorker Cache API and the Storage specification explicit and consistent, addressing the core issue raised in https://github.com/w3c/ServiceWorker/issues/1784 and the follow-up work in https://github.com/w3c/ServiceWorker/issues/1788.


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You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1789

-- Commit Summary --

  * Fix: Align Cache API definitions with Storage spec

-- File Changes --

    M docs/index.bs (6)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1789.patch
https://github.com/w3c/ServiceWorker/pull/1789.diff

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