feat: add dnsmasq DNS record admin UI

- store records in SQLite via built-in node:sqlite, no native deps
- wrap DB reads in await io() so they stay out of the static shell
- add CRUD pages backed by Server Actions with per-request data
- generate managed config and restart container via Docker socket
- add /resolve page to query dnsmasq for A and CNAME records
- add Dockerfile and compose setup with shared config volume

Dockerfile

@@ -0,0 +1,18 @@
+# node:sqlite needs Node >= 22.5, so this must not drop below 22.
+FROM node:24-alpine
+
+RUN corepack enable
+
+WORKDIR /app
+
+COPY package.json pnpm-lock.yaml pnpm-workspace.yaml ./
+RUN pnpm install --frozen-lockfile
+
+COPY . .
+RUN pnpm build
+
+ENV NODE_ENV=production
+ENV HOSTNAME=0.0.0.0
+EXPOSE 3000
+
+CMD ["pnpm", "start"]