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/)

requirements.txt

@@ -0,0 +1,20 @@
+annotated-doc==0.0.4
+annotated-types==0.7.0
+anyio==4.13.0
+certifi==2026.2.25
+charset-normalizer==3.4.7
+click==8.3.2
+fastapi==0.135.3
+h11==0.16.0
+idna==3.11
+pydantic==2.12.5
+pydantic_core==2.41.5
+regex==2026.4.4
+requests==2.33.1
+starlette==1.0.0
+tiktoken==0.12.0
+typing-inspection==0.4.2
+typing_extensions==4.15.0
+urllib3==2.6.3
+uv==0.11.3
+uvicorn==0.44.0