restructure platform http to use flattened modules

[tim-smart]

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[changeset-bot]

🦋 Changeset detected

Latest commit: 14d1da6

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

This PR includes changesets to release 18 packages

Name	Type
@effect/platform-node-shared	Major
@effect/platform-browser	Major
@effect/platform-node	Major
@effect/platform-bun	Major
@effect/platform	Minor
@effect/rpc-http	Major
@effect/rpc	Major
@effect/cli	Major
@effect/experimental	Major
@effect/sql-mssql	Major
@effect/sql-mysql2	Major
@effect/sql-pg	Major
@effect/sql-sqlite-bun	Major
@effect/sql-sqlite-node	Major
@effect/sql	Major
@effect/sql-drizzle	Major
@effect/sql-sqlite-react-native	Major
@effect/sql-sqlite-wasm	Major

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