Adopt @lavamoat/allow-scripts to gate npm install scripts

Disables dependency lifecycle scripts by default via .npmrc
(ignore-scripts=true) so arbitrary packages cannot execute code at
install time. An explicit allowlist in web/package.json opts specific
packages back in, and CI/Docker/Taskfile now run allow-scripts after
npm install to apply it.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Dockerfile

@@ -1,8 +1,8 @@
 # Stage 1: Build React frontend
 FROM node:22-alpine AS frontend
 WORKDIR /app/web
-COPY web/package*.json ./
-RUN npm install
+COPY web/package*.json web/.npmrc ./
+RUN npm install && npm exec -- allow-scripts
 COPY web/ ./
 RUN npm run build