fix(orchestrator): add prisma CLI as devDependency for prisma:generate script

The prisma:generate script added in #703 calls 'prisma generate' but the
prisma CLI was not installed in the orchestrator package. Adding it as a
devDependency so pnpm can resolve it during the monorepo build step.

pnpm-lock.yaml

@@ -389,6 +389,9 @@ importers:
       '@vitest/coverage-v8':
         specifier: ^4.0.18
         version: 4.0.18(vitest@4.0.18(@opentelemetry/api@1.9.0)(@types/node@22.19.7)(jiti@2.6.1)(jsdom@26.1.0)(terser@5.46.0)(tsx@4.21.0)(yaml@2.8.2))
+      prisma:
+        specifier: ^6.19.2
+        version: 6.19.2(magicast@0.3.5)(typescript@5.9.3)
       ts-node:
         specifier: ^10.9.2
         version: 10.9.2(@swc/core@1.15.11)(@types/node@22.19.7)(typescript@5.9.3)