add Langfuse tracing to agent runs and tool calls

api/config.py

@@ -19,6 +19,9 @@ class Settings(BaseSettings):
     aws_default_region: str = "us-east-1"
     bedrock_model_id: str = "anthropic.claude-sonnet-4-20250514-v1:0"
     kong_proxy_url: str = ""
+    langfuse_public_key: str = ""
+    langfuse_secret_key: str = ""
+    langfuse_host: str = "http://langfuse:3000"
 
     model_config = {"env_prefix": "", "case_sensitive": False}