fix: exclude /api/health from middleware for k8s health checks

The readiness probe was failing because /api/health was being processed
through NextAuth middleware, causing connection delays/failures. Health
checks need immediate response without auth processing.

Changes:
- Exclude api/health from middleware matcher
- Health endpoint now bypasses all NextAuth middleware
- Fixes 502 Bad Gateway errors due to failing readiness probes

Author: flowcore-platform

middleware.ts

@@ -74,5 +74,7 @@ export default withAuth(
 )
 
 export const config = {
-  matcher: ["/((?!_next/static|_next/image|favicon.ico|.*\\.(?:svg|png|jpg|jpeg|gif|webp)$).*)"],
+  matcher: [
+    "/((?!_next/static|_next/image|favicon.ico|api/health|.*\\.(?:svg|png|jpg|jpeg|gif|webp)$).*)",
+  ],
 }