Update app.js

app.js

@@ -226,7 +226,7 @@ app.post('/poll', async (req, res) => {
 // Endpoint: /cleanup
 // Memory management: Clears old JWT secrets from RAM that haven't been used recently.
 // Does NOT delete from Firebase.
-app.post('/cleanup', (req, res) => {
+app.get('/cleanup', (req, res) => {
     const THRESHOLD = 1000 * 60 * 60; // 1 Hour
     const now = Date.now();
     let cleanedCount = 0;