Use prisma db push instead of migrate deploy on startup

Eliminates the need to generate and commit migration files locally
before first deploy. Schema is synced directly from schema.prisma
on container start.

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

server/package.json

@@ -5,7 +5,7 @@
     "dev": "tsx watch src/index.ts",
     "build": "tsc",
     "start": "node dist/index.js",
-    "start:prod": "prisma migrate deploy && node dist/index.js",
+    "start:prod": "prisma db push && node dist/index.js",
     "db:migrate": "prisma migrate dev",
     "db:push": "prisma db push",
     "db:generate": "prisma generate",