Use yarn for root install, npm for backend

- Use yarn for root level (has yarn.lock)
- Use npm ci for backend (no yarn.lock)
- Skip devDependencies for backend (not needed for production)

Co-Authored-By: Claude <noreply@anthropic.com>

Dockerfile

@@ -2,30 +2,30 @@ FROM node:20-slim
 
 ENV DEBIAN_FRONTEND=noninteractive
 
-# Build timestamp: 2026-01-12T23:30
+# Build timestamp: 2026-01-12T23:40
 
 RUN apt-get update && apt-get install -y curl git git-lfs && rm -rf /var/lib/apt/lists/*
 
+# Install yarn
+RUN npm install -g yarn tsx esbuild
+
 WORKDIR /app
 
 # Initialize git-lfs
 RUN git lfs install
 
-# Copy package files
+# Copy all package files
 RUN mkdir -p app backend
 COPY trigo-web/package.json ./package.json
-COPY trigo-web/package-lock.json ./package-lock.json
+COPY trigo-web/yarn.lock ./yarn.lock
 COPY trigo-web/backend/package.json ./backend/package.json
-COPY trigo-web/backend/package-lock.json ./backend/package-lock.json
 
-# Install build tools
-RUN npm install -g tsx esbuild
+# Install root deps with yarn
+RUN yarn install --production --frozen-lockfile || yarn install --production
 
-# Install root deps (production only)
-RUN npm ci --omit=dev || npm install --omit=dev --force
-
-# Install backend deps with retry
-RUN cd backend && (npm ci || npm install --force)
+# Install backend deps (no yarn.lock, use npm)
+COPY trigo-web/backend/package-lock.json ./backend/package-lock.json
+RUN cd backend && npm ci --omit=dev || npm install --omit=dev --force
 
 # Copy backend source
 COPY trigo-web/backend/src/ ./backend/src/
@@ -37,7 +37,7 @@ RUN mkdir -p backend/dist/backend/src && \
     --outfile=backend/dist/backend/src/server.js \
     --external:express --external:socket.io --external:cors --external:dotenv --external:uuid
 
-# Copy pre-built frontend dist directly (skip app npm install and vite build)
+# Copy pre-built frontend dist
 COPY trigo-web/app/dist/ ./app/dist/
 
 # Copy public folder
@@ -48,16 +48,15 @@ COPY trigo-web/.env ./.env
 COPY trigo-web/backend/.env ./backend/.env
 COPY trigo-web/backend/.env.local ./backend/.env.local
 
-# Copy inc folder (shared types)
+# Copy inc folder
 COPY trigo-web/inc/ ./inc/
 
 # Copy parser
 COPY trigo-web/public/lib/tgnParser.cjs ./public/lib/
 
-# Check that LFS files were properly copied
+# Check LFS files
 RUN echo "=== Checking LFS files ===" && \
     ls -la app/dist/assets/*.wasm 2>/dev/null || echo "No WASM files found" && \
-    ls -la app/dist/onnx/*/*.onnx 2>/dev/null | head -5 || echo "No ONNX files found" && \
     file app/dist/assets/*.wasm 2>/dev/null | head -1 || echo "Cannot check file type"
 
 ENV PORT=7860
@@ -66,4 +65,4 @@ ENV NODE_ENV=production
 
 EXPOSE 7860
 
-CMD ["npm", "run", "start:prod"]
+CMD ["yarn", "start:prod"]