Remove .env.example and fix auth cookie secure flag

Delete the environment variable example file. Add error handling to the
Ollama AI route. Update Docker configuration to support Ollama services
and create required image directories. Fix indentation in auth library
and allow overriding secure cookie setting in non-production environments.

Dockerfile

@@ -27,6 +27,8 @@ COPY --from=builder /app/prisma ./prisma
 COPY --from=builder /app/node_modules/@prisma ./node_modules/@prisma
 COPY --from=builder /app/node_modules/prisma ./node_modules/prisma
 
+RUN mkdir -p /app/public/images/user && chown -R nextjs:nodejs /app/public
+
 USER nextjs
 
 EXPOSE 3000