fix: use npm install instead of npm ci in Dockerfile

npm ci fails with optional platform-specific dependencies (@emnapi/core,
@emnapi/runtime) that are not recorded in the lock file for Alpine Linux.
npm install handles optional dependencies correctly.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Dockerfile

@@ -7,7 +7,7 @@ WORKDIR /app
 
 # Install dependencies first (better layer caching)
 COPY package.json package-lock.json ./
-RUN npm ci
+RUN npm install
 
 # Copy source and build
 COPY . .