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

.gitignore

@@ -0,0 +1,44 @@
+# Dependencies
+node_modules/
+.pnp
+.pnp.js
+
+# Build outputs
+dist/
+build/
+.next/
+out/
+*.tsbuildinfo
+
+# Environment
+.env
+.env*.local
+
+# Logs
+logs/
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+
+# OS
+.DS_Store
+Thumbs.db
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# Testing
+coverage/
+.nyc_output/
+
+# Prisma
+packages/database/prisma/migrations/
+
+# Misc
+.turbo/