refactor: improve dependency installation logic in Dockerfile

Dockerfile

@@ -5,7 +5,12 @@ WORKDIR /app
 
 # Install dependencies
 COPY package*.json ./
-RUN npm ci --omit=dev || npm install --omit=dev
+# Use npm ci when a lockfile is present, otherwise fallback to npm install without throwing an error
+RUN if [ -f package-lock.json ] || [ -f npm-shrinkwrap.json ]; then \
+            npm ci --omit=dev; \
+        else \
+            npm install --omit=dev; \
+        fi
 
 # Copy app source (media lives outside via volume)
 COPY . .