chore: add Docker local development stack and fix server export scope

.dockerignore

@@ -4,4 +4,8 @@ coverage
 .git
 .github
 test
-README.md
+README.md
+.env
+.env.local
+docker-compose.override.yml
+.dockerignore

.env.example

@@ -1,3 +1,14 @@
+# Server
+PORT=4000
+
+# Redis
+REDIS_HOST=redis
+REDIS_PORT=6379
+REDIS_PASSWORD=
+REDIS_URL=redis://redis:6379
+
+# Database
+DATABASE_URL=postgres://smartdrop:smartdrop@postgres:5432/smartdrop
 # Runtime environment
 # NODE_ENV: string enum (development, test, production). Default: development.
 NODE_ENV=development
@@ -36,13 +47,10 @@ PRICE_STALE_THRESHOLD_MINUTES=5
 PRICE_ANOMALY_THRESHOLD_PCT=20
 
 # API key auth
-# Generate with: node -e "console.log(require('crypto').randomBytes(32).toString('hex'))"
 ADMIN_API_KEY=
 
 # LOG_LEVEL: string enum (debug, info, warn, error). Default: info.
 LOG_LEVEL=info
 
 # CORS
-# Comma-separated list of allowed origins (no trailing slashes)
-# Production: CORS_ALLOWED_ORIGINS=https://app.smartdrop.io,https://staging.smartdrop.io
-CORS_ALLOWED_ORIGINS=http://localhost:3000,http://localhost:3001
+CORS_ALLOWED_ORIGINS=http://localhost:4000,http://localhost:3001

Dockerfile

@@ -1,12 +1,34 @@
-FROM node:20-alpine
+# --- Base & Development Stage ---
+FROM node:20-alpine AS development
+WORKDIR /app
+
+# Instalar dependencias completas (incluye devDependencies para nodemon/hot-reload)
+COPY package*.json ./
+RUN npm install --legacy-peer-deps
+
+# Copiar el código fuente
+COPY . .
 
+EXPOSE 4000
+CMD ["npm", "run", "dev"]
+
+# --- Builder Stage para Producción ---
+FROM node:20-alpine AS builder
 WORKDIR /app
 
 COPY package*.json ./
 RUN npm ci --omit=dev
 
 COPY src ./src
 
-EXPOSE 3000
+# --- Production Stage ---
+FROM node:20-alpine AS production
+WORKDIR /app
+ENV NODE_ENV=production
+
+COPY --from=builder /app/node_modules ./node_modules
+COPY --from=builder /app/src ./src
+COPY package*.json ./
 
+EXPOSE 4000
 CMD ["node", "src/index.js"]