Remove runtime mode selection & have unified setup flow for node.js + API access

src/ipc/ipc_host.ts

@@ -5,6 +5,7 @@ import { registerSettingsHandlers } from "./handlers/settings_handlers";
 import { registerShellHandlers } from "./handlers/shell_handler";
 import { registerDependencyHandlers } from "./handlers/dependency_handlers";
 import { registerGithubHandlers } from "./handlers/github_handlers";
+import { registerNodeHandlers } from "./handlers/node_handlers";
 
 export function registerIpcHandlers() {
   // Register all IPC handlers by category
@@ -15,4 +16,5 @@ export function registerIpcHandlers() {
   registerShellHandlers();
   registerDependencyHandlers();
   registerGithubHandlers();
+  registerNodeHandlers();
 }