fix: add HTTP API proxy routes and health check to nginx for microservices

[rsun19]

Summary

Adds proxy rules to the HTTP server block in nginx.conf so that internal frontend SSR requests (and the HTTPS redirect server) can route to the correct microservices.

Changes

Added location blocks on the HTTP (port 80) server for each microservice API path:

Path	Upstream
/api/v1/stops	stops:3003
/api/v1/routes	routes:3002
/api/v1/trips	routes:3002
/api/v1/alerts	alerts:3004
/api/v1/vehicles	vehicles:3005
/api/v1/agencies	agencies:3001
/health	agencies:3001

All other traffic continues to redirect to https://www.trackthemetro.com.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 7d1de584-7921-4689-ac97-aa6de6113baf

📥 Commits

Reviewing files that changed from the base of the PR and between 9402f63 and d59a047.

📒 Files selected for processing (1)

• nginx.conf

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch make-nginx-redirect-https

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