feat: update Dockerfile with multi-stage TypeScript build and env vars

Dockerfile

@@ -3,27 +3,42 @@ FROM node:20-alpine AS frontend-builder
 
 WORKDIR /app/frontend
 
+# Copy frontend package files and install ALL dependencies (including devDependencies for build)
 COPY frontend/package*.json ./
 RUN npm ci
 
+# Copy frontend source and build
 COPY frontend/ ./
 RUN npm run build
 
-# Stage 2: Production Server
+# Stage 2: Build Backend
+FROM node:20-alpine AS backend-builder
+
+WORKDIR /app/backend
+
+# Copy backend package files and install ALL dependencies (including TypeScript)
+COPY backend/package*.json ./
+RUN npm ci
+
+# Copy backend source and compile TypeScript
+COPY backend/ ./
+RUN npm run build
+
+# Stage 3: Production Runtime
 FROM node:20-alpine
 
 WORKDIR /app
 
-# Install production dependencies
+# Install production dependencies only
 COPY backend/package*.json ./
 RUN npm ci --only=production && \
     npm cache clean --force
 
-# Copy backend source
-COPY backend/ ./
+# Copy compiled backend from builder
+COPY --from=backend-builder /app/backend/dist ./dist
 
-# Copy built frontend
-COPY --from=frontend-builder /app/frontend/dist ./public
+# Copy built frontend into public directory for Express to serve
+COPY --from=frontend-builder /app/frontend/dist ./dist/public
 
 # Create temp upload directory
 RUN mkdir -p /app/temp && \
@@ -32,12 +47,18 @@ RUN mkdir -p /app/temp && \
 # Switch to non-root user
 USER node
 
+# Environment variables (can be overridden via Unraid UI)
+ENV NODE_ENV=production
+ENV PORT=3000
+ENV MAX_FILE_SIZE=10485760
+ENV TEMP_DIR=/app/temp
+
 # Expose port
 EXPOSE 3000
 
 # Health check
 HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
-    CMD node -e "require('http').get('http://localhost:3000/api/health', (r) => {process.exit(r.statusCode === 200 ? 0 : 1)})"
+    CMD node -e "require('http').get('http://localhost:3000/', (r) => {process.exit(r.statusCode === 200 ? 0 : 1)})"
 
 # Start server
-CMD ["node", "src/server.js"]
+CMD ["node", "dist/index.js"]