fix(orchestrator): use symlink path in prisma:generate script

PR #707 added the symlink apps/orchestrator/prisma/schema.prisma but
accidentally reverted the script back to ../api/prisma/schema.prisma.

Docker does not have apps/api/prisma/ — the symlink IS the schema.
Change script to ./prisma/schema.prisma so both CI (symlink resolved)
and Docker (symlink followed by kaniko COPY) work correctly.

apps/orchestrator/package.json

@@ -7,7 +7,7 @@
     "dev": "nest start --watch",
     "lint": "eslint src/",
     "lint:fix": "eslint src/ --fix",
-    "prisma:generate": "prisma generate --schema=../api/prisma/schema.prisma",
+    "prisma:generate": "prisma generate --schema=./prisma/schema.prisma",
     "start": "node dist/main.js",
     "start:debug": "nest start --debug --watch",
     "start:dev": "nest start --watch",