feat: add global Deriv configuration and improve data parsing

- Added global Deriv token and stake settings to Admin Dashboard.
- Enhanced symbol normalization in the Yahoo Finance worker.
- Refined error logging across services and added a trade diagnostic test script.

test-trades.ts

@@ -0,0 +1,25 @@
+import { db } from "./src/lib/firebase";
+import { collection, getDocs, query, where } from "firebase/firestore";
+
+(async () => {
+    try {
+        const usersSnap = await getDocs(query(collection(db, 'users'), where('email', '==', 'desartstudiopro@gmail.com')));
+        if (usersSnap.empty) {
+            console.log('User not found');
+            return;
+        }
+        const user = usersSnap.docs[0];
+        console.log(`Checking auto_trades for user ${user.id}`);
+        const tradesSnap = await getDocs(collection(db, 'users', user.id, 'auto_trades'));
+        if (tradesSnap.empty) {
+             console.log('No trades found for this user.');
+        } else {
+             console.log('Found ' + tradesSnap.size + ' trades:');
+             tradesSnap.forEach(t => console.log(t.id, t.data()));
+        }
+        process.exit(0);
+    } catch(e) {
+        console.error('Error:', e);
+        process.exit(1);
+    }
+})();