fix: add /health endpoint for Kubernetes probes

Kubernetes probes were checking /health but the endpoint was at /api/health,
causing readiness probe failures and 502 errors. Added new /health route at
the root to match probe configuration and excluded it from middleware.

Changes:
- Add app/health/route.ts for Kubernetes probes at /health
- Exclude /health from middleware matcher (in addition to /api/health)
- Fixes 502 Bad Gateway by properly responding to health checks

Author: flowcore-platform

app/health/route.ts

@@ -0,0 +1,18 @@
+import { NextResponse } from "next/server"
+
+export const dynamic = "force-dynamic"
+export const runtime = "nodejs"
+
+/**
+ * Public health check endpoint for Kubernetes probes
+ * Used to verify the application is running and responding
+ * Located at /health (not /api/health) to match Kubernetes probe configuration
+ */
+export async function GET() {
+  return NextResponse.json({
+    status: "ok",
+    timestamp: new Date().toISOString(),
+    service: "graphable",
+    version: process.env.npm_package_version || "unknown",
+  })
+}

middleware.ts

@@ -75,6 +75,6 @@ export default withAuth(
 
 export const config = {
   matcher: [
-    "/((?!_next/static|_next/image|favicon.ico|api/health|.*\\.(?:svg|png|jpg|jpeg|gif|webp)$).*)",
+    "/((?!_next/static|_next/image|favicon.ico|health|api/health|.*\\.(?:svg|png|jpg|jpeg|gif|webp)$).*)",
   ],
 }