fix dockerfile build error

Dockerfile

@@ -6,8 +6,9 @@ RUN apt-get update && apt-get install -y nodejs npm python3 make g++ && rm -rf /
 
 COPY ./src/ .
 
-# Install frontend dependencies before dotnet build
-RUN npm install --prefix ./GreenHome.Web
+# Use npm ci for clean install based on package-lock.json
+RUN cd ./GreenHome.Web && \
+    npm ci
 
 RUN dotnet restore --verbosity detailed
 RUN dotnet publish -c Release -o /app