Fix: move prisma generate out of postinstall to fix Docker build

package.json

@@ -7,7 +7,6 @@
     "build": "next build",
     "start": "next start",
     "lint": "eslint",
-    "postinstall": "prisma generate",
     "test:db": "tsx scripts/test-alloydb.ts",
     "migrate:postgres": "tsx scripts/migrate-from-postgres.ts",
     "migrate:reassign": "tsx scripts/reassign-migrated-data.ts",
@@ -16,7 +15,8 @@
     "firebase:deploy:indexes": "firebase deploy --only firestore:indexes",
     "firebase:deploy:app": "npm run build && firebase deploy --only functions,hosting",
     "firebase:deploy:all": "npm run build && firebase deploy",
-    "mcp:server": "node mcp-server.js"
+    "mcp:server": "node mcp-server.js",
+    "prisma:generate": "prisma generate"
   },
   "dependencies": {
     "@auth/core": "^0.34.3",