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

apps/api/.env.example

@@ -0,0 +1,5 @@
+PORT=3000
+NODE_ENV=development
+DATABASE_URL="postgresql://postgres:postgres@localhost:5432/sdi_saas?schema=public"
+CORS_ORIGIN=http://localhost:3001
+JWT_SECRET=your-secret-key-change-in-production