fix(api): update Prisma version in Dockerfile to match project

The Dockerfile installed prisma@6.13.0 in the production stage but the
project uses prisma@6.18.0. Version mismatch between builder and
production stages can cause schema parsing errors.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: tofikwest

apps/api/Dockerfile.multistage

@@ -92,7 +92,7 @@ ENV NODE_ENV=production
 ENV PORT=3333
 
 # Install Prisma CLI and regenerate client in production stage
-RUN npm install -g prisma@6.13.0 && \
+RUN npm install -g prisma@6.18.0 && \
     prisma generate --schema=./prisma/schema.prisma
 
 # Create non-root user