feat(api): rename /config to /setup

[ssilvius]

Summary

• Renames the /config endpoint to /setup for config file download

Closes #47

Test plan

• GET /setup?key=<api_key> returns ctd.toml
• GET /setup?key=<api_key>&format=json returns JSON config

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Renames the config download API endpoint from /config to /setup to align the public route with “setup” terminology.

Changes:

• Remounts the existing config download router under /setup instead of /config.

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[Copilot]

There are app-level Vitest smoke tests (e.g., /health, 404), but nothing asserting that the config download route is mounted at the new /setup path. Adding a simple test that /setup responds (e.g., 401 for missing/invalid key) would prevent regressions on future route refactors.

[Copilot]

Changing the mount from /config to /setup is a breaking API change: any existing clients calling /config will now get a 404. If backward compatibility is desired, consider temporarily mounting the same router on both paths (or adding a redirect/deprecation response on /config) and documenting a removal timeline.

Suggested change

	app.route('/setup', configApp);
	app.route('/setup', configApp);
	app.route('/config', configApp);