fix: Dockerfile — use npm install instead of npm ci for lock file compat

Dockerfile

@@ -2,7 +2,7 @@
 FROM node:20-alpine AS frontend
 WORKDIR /app/frontend
 COPY frontend/package*.json ./
-RUN npm ci
+RUN npm install
 COPY frontend/ ./
 RUN npx nuxi generate
 
@@ -10,7 +10,7 @@ RUN npx nuxi generate
 FROM node:20-alpine AS backend
 WORKDIR /app/backend
 COPY backend/package*.json ./
-RUN npm ci
+RUN npm install
 COPY backend/ ./
 RUN npx prisma generate
 RUN npm run build