feat: add more info in sysp

prompt.go

@@ -3,6 +3,7 @@ package goba
 import (
 	_ "embed"
 	"fmt"
+	"time"
 )
 
 //go:embed README.md
@@ -13,8 +14,14 @@ func (ag *Agent) system(role PermRole, grp int64) (string, error) {
 	if err != nil {
 		return "", err
 	}
+	t := time.Now()
+	typ := "群聊"
+	if grp < 0 {
+		typ = "私聊"
+	}
 	return fmt.Sprintf(
 		sysp, ag.id, ag.nickname, ag.sex,
 		ag.chars, tab, ag.memoryof(grp),
+		t.Format(time.RFC3339), t.Unix(), typ,
 	), nil
 }