feat: migración a PostgreSQL, tiempo real SSE, Dockerfile y compose para Coolify

Dockerfile

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+# ==========================================
+# STAGE 1: Build Frontend & Server Bundle
+# ==========================================
+FROM node:22-alpine AS builder
+
+WORKDIR /app
+
+# Instalar dependencias completas para build
+COPY package*.json ./
+RUN npm ci
+
+# Copiar código fuente
+COPY . .
+
+# Compilar frontend (Vite) y backend (esbuild)
+RUN npm run build
+
+# ==========================================
+# STAGE 2: Imagen Ligera de Producción
+# ==========================================
+FROM node:22-alpine AS runner
+
+WORKDIR /app
+
+ENV NODE_ENV=production
+ENV PORT=3000
+
+# Instalar únicamente dependencias de producción
+COPY package*.json ./
+RUN npm ci --omit=dev && npm cache clean --force
+
+# Copiar artefactos compilados del builder
+COPY --from=builder /app/dist ./dist
+COPY --from=builder /app/dist-server ./dist-server
+
+# Exponer puerto de la aplicación
+EXPOSE 3000
+
+# Health check nativo de Docker
+HEALTHCHECK --interval=20s --timeout=5s --start-period=10s --retries=3 \
+  CMD wget --no-verbose --tries=1 --spider http://127.0.0.1:3000/api/health || exit 1
+
+# Iniciar servidor Express optimizado
+CMD ["node", "dist-server/index.js"]