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refactor(solid): type createOwner only through solid-js/internal (#4515)

Ryan's call on #4444 (2026-10-30): `createOwner` isn't intended as
application API, and 1.x had none. Like the boundary primitives in
#3709, it stays a runtime export of both solid-js entries but is
`@internal` (stripped from the declarations) and typed for renderers in
`solid-js/internal`. Apps host a scope with `createRoot()` and re-enter
it with `runWithOwner()`.

@solidjs/web keeps importing it from solid-js at runtime, with a
`@ts-expect-error` on the two typed imports (`Portal`, the frames
client), so the bundle holds one binding: 0 B on every size scenario.
Importing it through solid-js/internal instead cost +6 to +29 B
minified. The web specs that create owners import it from
solid-js/internal.

Supersedes #4508.


Claude-Session: https://claude.ai/code/session_015hPxMkC3jg3Uivh65gvaf2

Co-authored-by: Claude <noreply@anthropic.com>

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