Initial commit: SDI SaaS Platform foundation

- Complete monorepo structure with pnpm workspaces
- Prisma database schema with 20+ entities
- NestJS API with 9 core modules
- BullMQ orchestration worker
- AWS and Azure provider adapters
- Docker Compose infrastructure
- Complete documentation

packages/database/.env.example

@@ -0,0 +1 @@
+DATABASE_URL="postgresql://postgres:postgres@localhost:5432/sdi_saas?schema=public"