refactor(apps): remove doubao app_type conversion in +create, let server decide via source_agent

shortcuts/apps/apps_create.go

@@ -62,14 +62,10 @@ func buildAppsCreateBody(rctx *common.RuntimeContext) map[string]interface{} {
 	// --app-type is constrained to the lowercase enum (html / full_stack) by the
 	// flag's Enum, so send it through verbatim. Legacy uppercase compatibility is
 	// a server concern and is intentionally not surfaced by the CLI.
-	appType := rctx.Str("app-type")
 	agent := envvars.AgentName()
-	if appType == "html" && strings.HasPrefix(agent, "doubao") {
-		appType = "modern_html"
-	}
 	body := map[string]interface{}{
 		"name":     strings.TrimSpace(rctx.Str("name")),
-		"app_type": appType,
+		"app_type": rctx.Str("app-type"),
 	}
 	if desc := strings.TrimSpace(rctx.Str("description")); desc != "" {
 		body["description"] = desc