fix(openapi): return fresh cached specs

[xianjianlf2]

Fixes #6330

Summary

• keep the internal OpenApi.fromApi cache but return fresh deep copies to callers
• preserve special OpenAPI keys like proto as own enumerable properties while cloning
• add regression coverage for external mutation not affecting later cached calls

Tests

• pnpm test packages/effect/test/unstable/httpapi/OpenApi.test.ts
• pnpm lint-fix
• pnpm check

[changeset-bot]

🦋 Changeset detected

Latest commit: c33e7f3

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

This PR includes changesets to release 27 packages

Name	Type
effect	Patch
@effect/opentelemetry	Patch
@effect/platform-browser	Patch
@effect/platform-bun	Patch
@effect/platform-node-shared	Patch
@effect/platform-node	Patch
@effect/vitest	Patch
@effect/ai-anthropic	Patch
@effect/ai-openai-compat	Patch
@effect/ai-openai	Patch
@effect/ai-openrouter	Patch
@effect/atom-react	Patch
@effect/atom-solid	Patch
@effect/atom-vue	Patch
@effect/sql-clickhouse	Patch
@effect/sql-d1	Patch
@effect/sql-libsql	Patch
@effect/sql-mssql	Patch
@effect/sql-mysql2	Patch
@effect/sql-pg	Patch
@effect/sql-pglite	Patch
@effect/sql-sqlite-bun	Patch
@effect/sql-sqlite-do	Patch
@effect/sql-sqlite-node	Patch
@effect/sql-sqlite-react-native	Patch
@effect/sql-sqlite-wasm	Patch
@effect/openapi-generator	Patch

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📥 Commits

Reviewing files that changed from the base of the PR and between 4e0be58 and c33e7f3.

📒 Files selected for processing (3)

• .changeset/fix-openapi-from-api-cache-copy.md
• packages/effect/src/unstable/httpapi/OpenApi.ts
• packages/effect/test/unstable/httpapi/OpenApi.test.ts

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