[Issue #298] Perf: API Response Caching with Cache-Control Headers

[Ogstevyn]

API routes have no Cache-Control headers. Every request hits the server even for infrequently-changing data.\n\nAdd Cache-Control: public, max-age=60 to /api/health. Cache-Control: public, max-age=30 to /api/metrics. Cache-Control: no-store to all auth routes.\n\nAcceptance Criteria: A second request to /api/health within 60 seconds is served from CDN cache.\n\nFiles: app/api/health/route.ts (Modify), app/api/metrics/route.ts (Modify), auth routes (Modify)

[Aonlike]

@Aonlike has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I would like to work on this issue. I am a Fullstack Developer.

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[mrmoney10010-design]

@mrmoney10010-design has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I would like to take on this performance and security optimization issue. Properly managing cache behavior at the routing layer is crucial for reducing server load on static endpoints while keeping sensitive authentication vectors strictly isolated.

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