Fix Dockerfile: npm ci requires a lockfile we don't have yet, use npm install

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Dockerfile

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