Fix server npm ci: add native build tools for better-sqlite3

better-sqlite3 requires python3/make/g++ to compile on Alpine.
Also switches deprecated --only=production to --omit=dev.
Build tools are removed after install to keep image size down.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Dockerfile

@@ -27,8 +27,10 @@ RUN apk add --no-cache dumb-init
 # Copy server package files
 COPY package*.json ./
 
-# Install production dependencies only
-RUN npm ci --only=production
+# Install build tools for native modules (better-sqlite3), then install deps
+RUN apk add --no-cache python3 make g++ && \
+    npm ci --omit=dev && \
+    apk del python3 make g++
 
 # Copy server code
 COPY server ./server