add initial Docker setup with .dockerignore, Dockerfile, docker-compose.yml, and deployment script

Dockerfile

@@ -0,0 +1,20 @@
+# BizGaze Support — server image
+# Node 24 ships node:sqlite as a stable built-in (no flag), which db.js relies on.
+FROM node:24-alpine
+
+ENV NODE_ENV=production
+WORKDIR /app/server
+
+# Install deps first for layer caching (only `ws`, plus optional nodemailer)
+COPY server/package*.json ./
+RUN npm install --omit=dev --no-audit --no-fund
+
+# App source
+COPY server/ ./
+
+# Served HTTP port (NPM terminates TLS and proxies here). DB lives on a volume.
+ENV PORT=8090
+ENV DB_PATH=/data/data.db
+EXPOSE 8090
+
+CMD ["node", "server.js"]