feat(infra): add mana-sync and mana-notify-go to docker-compose

- mana-sync on port 3051 (Go sync server for local-first apps)
- mana-notify-go on port 3040 (Go notification service)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

services/mana-user/Dockerfile

@@ -0,0 +1,16 @@
+FROM oven/bun:1 AS production
+
+WORKDIR /app
+
+COPY package.json bun.lock* ./
+RUN bun install --frozen-lockfile 2>/dev/null || bun install
+
+COPY src ./src
+COPY tsconfig.json drizzle.config.ts ./
+
+EXPOSE 3062
+
+HEALTHCHECK --interval=30s --timeout=10s --start-period=10s --retries=3 \
+  CMD bun -e "fetch('http://localhost:3062/health').then(r => process.exit(r.ok ? 0 : 1)).catch(() => process.exit(1))"
+
+CMD ["bun", "run", "src/index.ts"]