feat(ui): add composed profile shell, providers infra and stub router

[alexcarpenter]

Stack 4/7. New (unexported) infra for the composed profile API: ProfileProviderShell, stubRouter, useBillingRouter, useRequirePage, PageContext, createSection, plus the shared APIKeysSection/BillingSection used by both User and Org composed dirs.

Nothing is exported from the package yet. Empty changeset.

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Stack

#	PR	Layer
1	#9130	moduleManager getter across build boundary
2	#9131	shared profile UI infra
3	#9132	extract Section components from profile pages
4	#9133 👈	composed shell + providers infra
5	#9134	composed UserProfile
6	#9135	composed OrganizationProfile
7	#9136	expose @clerk/ui/experimental (public API)

Review and merge bottom-up (#9130 → #9136).

[changeset-bot]

🦋 Changeset detected

Latest commit: 6ff5709

The changes in this PR will be included in the next version bump.

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