Preserve OAuth resource indicator strings

[pradeep-ramola]

Fixes #1968

Summary

Preserves the exact OAuth resource indicator string published by protected resource metadata instead of normalizing it through URL.href.

Previously, pathless metadata resources such as https://example.com were converted into https://example.com/ when the SDK added the resource parameter to authorization and token requests.

Testing

• corepack pnpm --filter @modelcontextprotocol/client exec vitest run test/client/auth.test.ts
• corepack pnpm --filter @modelcontextprotocol/client typecheck
• corepack pnpm --filter @modelcontextprotocol/client build
• corepack pnpm --filter @modelcontextprotocol/client exec prettier --ignore-path ../../.prettierignore --check src/client/auth.ts test/client/auth.test.ts
• corepack pnpm --filter @modelcontextprotocol/client exec eslint src/client/auth.ts

[changeset-bot]

🦋 Changeset detected

Latest commit: 574649c

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

This PR includes changesets to release 6 packages

Name	Type
@modelcontextprotocol/client	Patch
@modelcontextprotocol/core	Patch
@modelcontextprotocol/server	Patch
@modelcontextprotocol/server-legacy	Patch
@modelcontextprotocol/codemod	Patch
@modelcontextprotocol/core-internal	Patch

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commit: 574649c

[KKonstantinov]

Thanks for this PR. Superseded by #2581