fix: symlink node_modules into .output/server + use curl for healthcheck

- Symlink ensures require('better-sqlite3') resolves from .output/server/
- Install curl for more reliable healthcheck
- Remove NODE_PATH (symlink is more reliable for native modules)

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

Dockerfile

@@ -1,15 +1,18 @@
 FROM node:24-alpine
-RUN apk add --no-cache python3 make g++
+RUN apk add --no-cache python3 make g++ curl
 WORKDIR /app
 COPY package.json ./
 RUN npm install
 RUN find node_modules -name "better_sqlite3.node" || (echo "FATAL: binding not found" && exit 1)
 COPY . .
 RUN npx nuxt build
+# Symlink node_modules into .output/server so external requires resolve
+RUN ln -s /app/node_modules /app/.output/server/node_modules
 RUN apk del make g++ && rm -rf /root/.cache /tmp/*
 RUN mkdir -p /data && chown node:node /data
 USER node
-ENV NODE_ENV=production NODE_PATH=/app/node_modules
+ENV NODE_ENV=production
 EXPOSE 3000
-HEALTHCHECK NONE
+HEALTHCHECK --interval=10s --timeout=5s --retries=10 --start-period=60s \
+  CMD curl -sf http://localhost:3000/api/health || exit 1
 ENTRYPOINT ["node", ".output/server/index.mjs"]