Add initial project structure with Docker, CI, and FastAPI setup

- Create Dockerfile and docker-compose.yml for containerization
- Add CI configuration for linting and testing
- Implement FastAPI application with health check routes
- Set up database schema using DuckDB
- Include environment configuration and secrets management
- Add README with project objectives and key features
- Implement logging setup and configuration
- Create initial tests for health route
- Add HTML templates for web interface

.env.example

@@ -0,0 +1,9 @@
+APP_ENV=dev
+APP_HOST=0.0.0.0
+APP_PORT=8000
+LOG_LEVEL=INFO
+LOG_JSON=true
+DUCKDB_PATH=./data/arbitrade.duckdb
+FERNET_KEY=
+KRAKEN_API_KEY=
+KRAKEN_API_SECRET=