chore(api): add docker compose and container image for no-reply service

.gitignore

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+node_modules/
+.env
+.DS_Store
+*.log

docker-compose.yml

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+services:
+  whispergate-no-reply-api:
+    build:
+      context: ./no-reply-api
+    container_name: whispergate-no-reply-api
+    ports:
+      - "8787:8787"
+    environment:
+      - PORT=8787
+      - NO_REPLY_MODEL=whispergate-no-reply-v1
+    restart: unless-stopped

no-reply-api/.dockerignore

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+node_modules
+npm-debug.log

no-reply-api/Dockerfile

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+FROM node:22-alpine
+WORKDIR /app
+COPY package.json ./
+COPY server.mjs ./
+EXPOSE 8787
+ENV PORT=8787
+CMD ["node", "server.mjs"]