feat: add conversation system action messages

server/store/store.go

@@ -3570,7 +3570,7 @@ func validIMMessageHeaderToken(value string, max int) bool {
 func validIMMessageType(value string) bool {
 	switch strings.TrimSpace(value) {
 	case "text", "image", "file", "audio", "voice", "video", "location", "contact", "contact_card",
-		"card", "link", "forward_bundle", "sticker", "call", "system", "system_event":
+		"card", "link", "forward_bundle", "sticker", "call", "system", "system_notice", "system_action", "system_event":
 		return true
 	default:
 		return false

server/store/tenant_store_test.go

@@ -19,6 +19,8 @@ func TestValidateMessageHeadersProductContract(t *testing.T) {
 		{"x-im-schema": json.Number("1"), "x-im-type": "voice"},
 		{"x-im-schema": "1", "x-im-type": "contact_card"},
 		{"x-im-schema": 1, "type": "audio", "x-im-type": "voice"},
+		{"x-im-schema": 1, "x-im-type": "system_notice"},
+		{"x-im-schema": 1, "x-im-type": "system_action"},
 		{"type": "system"},
 	}
 	for _, head := range valid {