Monorepo skeleton, Prisma schema, core domain and services with tests

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

pnpm-workspace.yaml

@@ -0,0 +1,11 @@
+packages:
+  - apps/*
+  - packages/*
+allowBuilds:
+  prisma: true
+  "@prisma/engines": true
+  esbuild: true
+  "@parcel/watcher": true
+  sharp: true
+  "@swc/core": true
+  unrs-resolver: true