Debug: add file verification, remove unneeded public folder copy

Dockerfile

@@ -2,7 +2,7 @@ FROM node:20-slim
 
 ENV DEBIAN_FRONTEND=noninteractive
 
-# Build timestamp: 2026-01-13T01:45
+# Build timestamp: 2026-01-13T02:00
 
 WORKDIR /app
 
@@ -24,17 +24,23 @@ RUN esbuild backend/src/server.ts --bundle --platform=node --target=node20 --for
     --outfile=backend/dist/backend/src/server.js \
     --external:express --external:socket.io --external:cors --external:dotenv --external:uuid
 
-# Copy frontend dist (LFS files excluded via .dockerignore)
+# Copy frontend dist
 COPY trigo-web/app/dist/ ./app/dist/
 
-# Copy public folder (ONNX excluded via .dockerignore)
-COPY trigo-web/public/ ./public/
-
 # Copy env files
-COPY trigo-web/.env ./.env
 COPY trigo-web/backend/.env ./backend/.env
 COPY trigo-web/backend/.env.local ./backend/.env.local
 
+# Debug: verify files exist
+RUN echo "=== Verifying files ===" && \
+    ls -la backend/dist/backend/src/ && \
+    ls -la app/dist/ && \
+    ls -la backend/ && \
+    echo "=== Node version ===" && \
+    node --version && \
+    echo "=== Package.json type ===" && \
+    cat package.json | grep type
+
 ENV PORT=7860
 ENV HOST=0.0.0.0
 ENV NODE_ENV=production