8643c3dfa7
NextAuth.js v5 requires an explicit API route to expose authentication endpoints. Added missing route handler at frontend/src/app/api/auth/[...nextauth]/route.ts that imports and exports handlers from the auth configuration. This fixes: - /api/auth/signin endpoint (was 404) - /api/auth/callback endpoint - /api/auth/session endpoint - Frontend authentication flow initialization Verification: Endpoint now returns HTTP 200 and frontend loads without ClientFetchError.