fix(serve): reject opaque Origin null in CSRF guard

[SutuSebastian]

Summary

• Remove the Origin: null exemption in csrfCheck so opaque browser contexts cannot POST to loopback codemap serve.
• Update CSRF tests to expect 403 on Origin: null against save_baseline.

Test plan

• bun test src/application/http-server.test.ts

[changeset-bot]

🦋 Changeset detected

Latest commit: 961e7ac

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

This PR includes changesets to release 1 package

Name	Type
@stainless-code/codemap	Patch

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 9b876c34-42fd-4362-b848-bf6d77823c69

📥 Commits

Reviewing files that changed from the base of the PR and between 2fd5eb4 and 961e7ac.

📒 Files selected for processing (3)

• .changeset/fix-serve-reject-origin-null.md
• src/application/http-server.test.ts
• src/application/http-server.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/serve-reject-origin-null

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