feat: Enhance Dockerfile with verification for standalone output and update n8n status route to handle missing webhook URL

Dockerfile

@@ -35,6 +35,20 @@ ENV NEXT_TELEMETRY_DISABLED=1
 ENV NODE_ENV=production
 RUN npm run build
 
+# Verify standalone output was created and show structure for debugging
+RUN if [ ! -d .next/standalone ]; then \
+      echo "ERROR: .next/standalone directory not found!"; \
+      echo "Contents of .next directory:"; \
+      ls -la .next/ || true; \
+      echo "Checking if standalone exists in different location:"; \
+      find .next -name "standalone" -type d || true; \
+      exit 1; \
+    fi && \
+    echo "✅ Standalone output found" && \
+    ls -la .next/standalone/ && \
+    echo "Standalone structure:" && \
+    find .next/standalone -type f -name "server.js" || echo "server.js not found in standalone"
+
 # Production image, copy all the files and run next
 FROM base AS runner
 WORKDIR /app
@@ -55,6 +69,8 @@ RUN chown nextjs:nodejs .next
 
 # Automatically leverage output traces to reduce image size
 # https://nextjs.org/docs/advanced-features/output-file-tracing
+# Copy standalone output (contains server.js and all dependencies)
+# The standalone output structure is: .next/standalone/app/
 COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone/app ./
 COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static