Fix Docker build: Copy .npmrc before npm ci

The .npmrc file contains legacy-peer-deps=true which is required
for installing dependencies with Vite 7 and @vitejs/plugin-vue2.

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Co-Authored-By: Claude Sonnet 4.5 <[email protected]>

Author: Tim020

Dockerfile

@@ -5,6 +5,7 @@ RUN mkdir -p /server/static
 
 COPY /client/package.json /client/package.json
 COPY /client/package-lock.json /client/package-lock.json
+COPY /client/.npmrc /client/.npmrc
 WORKDIR /client
 RUN npm ci
 COPY /client /client