Avoid importing authOptions/PrismaClient in the forwardAuth endpoint.
Under --network host (Coolify's build flag), routes that import Prisma
at module evaluation time are silently dropped from the build output.
Instead, read the NextAuth session-token cookie directly and verify
it with a raw SQL query against the sessions table - the same pattern
used by other working API routes via @/lib/db-postgres.
Co-authored-by: Cursor <cursoragent@cursor.com>