feat: initial project setup with scenarios, database and web ui

Add complete mockupAWS platform for AWS cost estimation:
- FastAPI backend with scenario management
- PostgreSQL database schema for scenarios, metrics, logs
- AWS pricing table with real pricing data
- React frontend dashboard (planned)
- PII detection and token counting
- Report generation (PDF/CSV)
- Complete test suite with pytest
- Docker Compose setup
- Documentation: README, PRD, Architecture
- OpenCode configuration (.opencode/)

mockupAWS/main.py

@@ -0,0 +1,6 @@
+def main():
+    print("Hello from mockupaws!")
+
+
+if __name__ == "__main__":
+    main()