more fixes

Dockerfile

@@ -8,16 +8,16 @@ COPY package*.json ./
 COPY yarn.lock* ./
 
 # Install all dependencies (including dev for build)
-RUN npm install && npm cache clean --force
+RUN yarn install --frozen-lockfile && yarn cache clean
 
 # Copy source code
 COPY . .
 
 # Build the application
-RUN npm run build
+RUN yarn build
 
 # Clean dev dependencies
-RUN npm prune --production
+RUN yarn install --production --frozen-lockfile
 
 # Production stage
 FROM node:18-alpine AS production