refactor: Replace Dockerfile with Dockerfile.fast for faster builds and add Dockerfile.test for testing purposes

Dockerfile.fast

@@ -2,35 +2,37 @@
 FROM node:20-alpine AS frontend-builder
 WORKDIR /app/frontend
 
-# Install yarn for faster package management
-RUN npm install -g yarn
+# Set npm config for better performance
+RUN npm config set registry https://registry.npmjs.org/
+RUN npm config set fetch-timeout 300000
+RUN npm config set fetch-retry-mintimeout 20000
+RUN npm config set fetch-retry-maxtimeout 120000
 
-# Copy package files
+# Copy package files first for better caching
 COPY frontend/package*.json ./
-COPY frontend/yarn.lock* ./
 
-# Install dependencies with yarn (faster than npm)
-RUN yarn install --frozen-lockfile --network-timeout 300000
+# Install dependencies with specific flags for speed
+RUN npm ci --only=production --no-audit --no-fund --prefer-offline
 
 # Copy source code
 COPY frontend/ .
 
 # Build the application
-RUN yarn build
+RUN npm run build
 
 # Stage 2: Setup Node.js backend and serve everything
 FROM node:20-alpine
 WORKDIR /app
 
-# Install yarn for faster package management
-RUN npm install -g yarn
+# Set npm config for better performance
+RUN npm config set registry https://registry.npmjs.org/
+RUN npm config set fetch-timeout 300000
 
-# Copy package files
+# Copy package files first for better caching
 COPY backend/package*.json ./
-COPY backend/yarn.lock* ./
 
 # Install production dependencies only
-RUN yarn install --frozen-lockfile --production --network-timeout 300000
+RUN npm ci --only=production --no-audit --no-fund --prefer-offline
 
 # Copy backend source code
 COPY backend/ .