fix(update): align version fallback with main.ts (0.3.1)

update.ts used '0.0.0' as fallback while main.ts used '0.3.1',
causing `minimax update` to show "Current version: 0.0.0".

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: 2 people

src/commands/update.ts

@@ -1,6 +1,6 @@
 import { defineCommand } from '../command';
 
-const CLI_VERSION = process.env.CLI_VERSION ?? '0.0.0';
+const CLI_VERSION = process.env.CLI_VERSION ?? '0.3.1';
 
 export default defineCommand({
   name: 'update',