chore: remove 11 unused upstream dependencies

[ichoosetoaccept]

Summary

Removes 11 unused upstream dependencies that were never integrated into the main server code.

Removed Dependencies

Production (10):

• fetch-cookie - Cookie handling for fetch
• form-data - Form data encoding
• http-proxy-agent - HTTP proxy support
• https-proxy-agent - HTTPS proxy support
• node-fetch - Node.js fetch polyfill
• open - Open URLs in browser (OAuth flow)
• pkce-challenge - PKCE auth flow
• socks-proxy-agent - SOCKS proxy support
• tough-cookie - Cookie jar implementation
• zod-to-json-schema - Zod schema conversion

Dev (1):

• @types/express - No longer needed

Verification

• Confirmed none of these packages are imported in src/
• Build passes ✅
• All 122 tests pass ✅

Notes

These were upstream leftovers for OAuth, proxy support, and other features that were never wired into the main server. The gitlabUseOAuth config option exists but is never consumed - OAuth implementation doesn't exist in this fork.

[ichoosetoaccept]

• fix: add knip config, pre-commit hook, fix Zod compatibility, and remove unused code #38
• chore: remove broken oauth-tests.ts and fix remote-auth-tests.ts #37
• chore: remove 11 unused upstream dependencies #36 👈 (View in Graphite)
• main

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[ichoosetoaccept]

Merge activity

• Dec 30, 10:00 AM UTC: A user started a stack merge that includes this pull request via Graphite.
• Dec 30, 10:00 AM UTC: @ichoosetoaccept merged this pull request with Graphite.

[github-actions]

🎉 This PR is included in version 0.3.1 🎉

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