feat: add notification microservices and transactional outbox

Dockerfile.microservices

@@ -0,0 +1,26 @@
+FROM node:22-alpine AS dependencies
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci
+
+FROM dependencies AS build
+COPY . .
+RUN npm run build
+
+FROM node:22-alpine AS api-gateway
+WORKDIR /app
+ENV NODE_ENV=production
+COPY --from=dependencies /app/node_modules ./node_modules
+COPY --from=build /app/dist ./dist
+COPY package.json ./
+EXPOSE 4000
+CMD ["node", "dist/main.js"]
+
+FROM node:22-alpine AS notification-service
+WORKDIR /app
+ENV NODE_ENV=production
+COPY --from=dependencies /app/node_modules ./node_modules
+COPY --from=build /app/dist ./dist
+COPY package.json ./
+EXPOSE 4001
+CMD ["node", "dist/apps/notification-service/main.js"]