支持工具调用：三个AI角色配置、工具注册表与流式工具轮

go.mod

@@ -3,14 +3,15 @@ module myaibot
 go 1.26.4
 
 require (
+	github.com/expr-lang/expr v1.17.8
 	github.com/openai/openai-go v1.12.0
 	github.com/peterh/liner v1.2.2
+	github.com/tidwall/gjson v1.14.4
 	gopkg.in/yaml.v3 v3.0.1
 )
 
 require (
 	github.com/mattn/go-runewidth v0.0.3 // indirect
-	github.com/tidwall/gjson v1.14.4 // indirect
 	github.com/tidwall/match v1.1.1 // indirect
 	github.com/tidwall/pretty v1.2.1 // indirect
 	github.com/tidwall/sjson v1.2.5 // indirect