add health check, run TTL cleanup, structured logging, proper HTTP status codes, Pydantic Settings

api/config.py

@@ -0,0 +1,28 @@
+"""Centralized configuration via Pydantic Settings."""
+
+from functools import lru_cache
+
+from pydantic_settings import BaseSettings
+
+
+class Settings(BaseSettings):
+    llm_provider: str = "groq"
+    groq_api_key: str = ""
+    groq_model: str = "llama-3.3-70b-versatile"
+    anthropic_api_key: str = ""
+    anthropic_model: str = "claude-sonnet-4-20250514"
+    openai_api_key: str = ""
+    openai_base_url: str = "https://api.openai.com/v1"
+    openai_model: str = "gpt-4o"
+    aws_access_key_id: str = ""
+    aws_secret_access_key: str = ""
+    aws_default_region: str = "us-east-1"
+    bedrock_model_id: str = "anthropic.claude-sonnet-4-20250514-v1:0"
+    kong_proxy_url: str = ""
+
+    model_config = {"env_prefix": "", "case_sensitive": False}
+
+
+@lru_cache
+def get_settings() -> Settings:
+    return Settings()