fix: Fallback to npm install if no package-lock.json

Dockerfile

@@ -6,8 +6,8 @@ WORKDIR /app
 # Copy package files
 COPY package*.json ./
 
-# Install dependencies
+# Install dependencies (use npm install if no lock file)
-RUN npm ci --omit=dev
+RUN if [ -f package-lock.json ]; then npm ci --omit=dev; else npm install --omit=dev; fi
 
 # Copy all source code
 COPY . .