fix(client): preserve OAuth resource metadata indicator

[Genmin]

Summary

Fixes #1968 by preserving the exact RFC 8707 resource indicator string published in protected resource metadata after validation, instead of serializing it through URL.href and normalizing pathless origins to include a trailing slash.

This keeps resource=https://example.com distinct from resource=https://example.com/ for authorization and token requests, which matters for OAuth providers that treat the resource/audience string literally.

Validation

• pnpm --filter @modelcontextprotocol/client test -- auth.test.ts
• pnpm --filter @modelcontextprotocol/client typecheck
• pnpm --filter @modelcontextprotocol/client lint
• pnpm --filter @modelcontextprotocol/client build
• pre-push hook: full workspace typecheck, build, and lint

[changeset-bot]

🦋 Changeset detected

Latest commit: 41dd3a1

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

This PR includes changesets to release 1 package

Name	Type
@modelcontextprotocol/client	Patch

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commit: 41dd3a1

[Genmin]

Addressed the remaining build/release blockers:\n\n- Exported OAuthResourceIndicator because it is referenced by public APIs, which clears the TypeDoc warning.\n- Added a patch changeset for @modelcontextprotocol/client.\n\nValidated locally:\n- pnpm run docs:check\n- pnpm --filter @modelcontextprotocol/client typecheck\n- pnpm --filter @modelcontextprotocol/client test\n- pre-push hook: build, lint, typecheck