Phase 2.1: Backend project initialized with Docker configuration

- Created Cargo.toml with all required dependencies
- Implemented health/ready endpoints
- Added Docker configuration (production + development)
- Configured docker-compose with resource limits
- Set up MongoDB service with persistence
- Verified build (cargo check passed)
- Prepared monorepo structure for mobile/web/shared

Next: Phase 2.2 (MongoDB connection and models)

backend/defaults.env

@@ -0,0 +1,4 @@
+RUST_LOG=debug
+SERVER_PORT=8000
+MONGODB_URI=mongodb://mongodb:27017
+MONGODB_DATABASE=normogen