Test/add initial smoke tests

[adidev001]

Summary

This PR adds an initial automated smoke test setup for reactome-mcp.

The main thing I wanted to do here was add a lightweight way to catch breakage in the MCP surface without relying on manual Inspector testing or live Reactome service calls every time. To make that possible, I pulled server construction into a small shared factory that can be used both by the runtime entrypoint and by tests.

Included in this PR

• added src/server.ts so the MCP server can be created in tests without starting stdio
• updated src/index.ts to use the shared server construction path
• added a separate TypeScript config for tests
• added build:test / test scripts
• ignored dist-test/
• added a small smoke test suite using node:test

Current test coverage

The suite currently checks:

• server initialization

• representative tool/resource/template registration

• mocked smoke tests for:

  • reactome_search
  • reactome_get_pathway
  • reactome_get_analysis_result

• invalid blank query/token cases

• representative static and templated resource handling

Notes

The tests stub the content and analysis client boundaries so they stay fast and deterministic.

I also tightened validation a bit for blank search queries and analysis tokens, mainly so those failure cases are clearer and easier to cover in tests.

Verified

• npm run build
• npm test