Fix Dockerfile build process

- Install all dependencies (including dev) for build step
- Remove dev dependencies after build to reduce image size
- This fixes the 'next: not found' error during build

Dockerfile

@@ -7,8 +7,8 @@ WORKDIR /app
 # Copy package files
 COPY package*.json ./
 
-# Install dependencies
-RUN npm ci --only=production
+# Install all dependencies (including dev dependencies for build)
+RUN npm ci
 
 # Copy the rest of the application
 COPY . .
@@ -16,6 +16,9 @@ COPY . .
 # Build the application
 RUN npm run build
 
+# Remove dev dependencies to reduce image size
+RUN npm prune --production
+
 # Expose the port that the app runs on
 EXPOSE 3000