fix(docker): skip prepare script during npm install (#196)

#142 added a `prepare` script that triggers `npm run build` when
dist/ is missing. During Docker build, `npm install` runs before
source files and tsconfig.json are copied, causing build failure.
Use --ignore-scripts to defer build to the explicit step.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Dockerfile

@@ -22,7 +22,7 @@ RUN ARCH=$(dpkg --print-architecture) \
 WORKDIR /app
 
 COPY package*.json ./
-RUN npm install
+RUN npm install --ignore-scripts
 
 COPY . .