Debug: add syntax check, install onnxruntime-web for WASM

Dockerfile

@@ -2,7 +2,7 @@ FROM node:20-slim
 
 ENV DEBIAN_FRONTEND=noninteractive
 
-# Build timestamp: 2026-01-13T02:00
+# Build timestamp: 2026-01-13T02:15
 
 WORKDIR /app
 
@@ -13,6 +13,9 @@ RUN npm install -g esbuild
 COPY trigo-web/backend/package.json ./package.json
 RUN npm install --omit=dev
 
+# Also install onnxruntime-web to get WASM files
+RUN npm install onnxruntime-web@1.23.2
+
 # Copy backend source and build
 RUN mkdir -p backend backend/dist/backend/src
 COPY trigo-web/backend/src/ ./backend/src/
@@ -24,9 +27,13 @@ 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
+# Copy frontend dist (but WASM might be LFS pointer)
 COPY trigo-web/app/dist/ ./app/dist/
 
+# Copy WASM files from onnxruntime-web package (proper binary, not LFS pointer)
+RUN cp node_modules/onnxruntime-web/dist/*.wasm app/dist/assets/ 2>/dev/null || \
+    cp node_modules/onnxruntime-web/dist/*.mjs app/dist/assets/ 2>/dev/null || true
+
 # Copy env files
 COPY trigo-web/backend/.env ./backend/.env
 COPY trigo-web/backend/.env.local ./backend/.env.local
@@ -34,12 +41,14 @@ 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/ && \
+    ls -la app/dist/assets/ | head -10 && \
+    echo "=== WASM files ===" && \
+    ls -la app/dist/assets/*.wasm 2>/dev/null || echo "No wasm files" && \
     echo "=== Node version ===" && \
-    node --version && \
-    echo "=== Package.json type ===" && \
-    cat package.json | grep type
+    node --version
+
+# Test that the server can be loaded (but don't actually start it during build)
+RUN node --check backend/dist/backend/src/server.js || echo "Syntax check failed"
 
 ENV PORT=7860
 ENV HOST=0.0.0.0
@@ -47,4 +56,5 @@ ENV NODE_ENV=production
 
 EXPOSE 7860
 
-CMD ["node", "backend/dist/backend/src/server.js"]
+# Use shell form to see errors better
+CMD node backend/dist/backend/src/server.js