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

src/arbitrade/config/settings.py

@@ -0,0 +1,27 @@
+from __future__ import annotations
+
+from functools import lru_cache
+from pathlib import Path
+
+from pydantic import Field
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    model_config = SettingsConfigDict(env_file=".env", env_file_encoding="utf-8", extra="ignore")
+
+    app_env: str = Field(default="dev", alias="APP_ENV")
+    app_host: str = Field(default="0.0.0.0", alias="APP_HOST")
+    app_port: int = Field(default=8000, alias="APP_PORT")
+
+    log_level: str = Field(default="INFO", alias="LOG_LEVEL")
+    log_json: bool = Field(default=True, alias="LOG_JSON")
+
+    duckdb_path: Path = Field(default=Path("./data/arbitrade.duckdb"), alias="DUCKDB_PATH")
+
+    fernet_key: str | None = Field(default=None, alias="FERNET_KEY")
+
+
+@lru_cache(maxsize=1)
+def get_settings() -> Settings:
+    return Settings()