fix(miniapp): inline createUuid in config to fix DevTools require

WeChat DevTools failed to resolve utils/uuid.js at runtime; move UUID
generation into config.js which is already loaded by app.js.

Co-authored-by: Cursor <cursoragent@cursor.com>

miniapp/utils/api.js

@@ -1,5 +1,5 @@
 const SESSION_KEY = 'tkmind_session';
-const { createUuid } = require('./uuid');
+const { createUuid } = require('./config');
 
 let apiBaseUrl = '';
 let cookie = '';