feat: send FCM token to backend on permission grant

app/utils/firebase.js

@@ -43,6 +43,28 @@ export async function requestNotificationPermission() {
     });
 
     console.log("[FCM] Token:", token);
+
+    // Send token to backend
+    if (token) {
+      try {
+        const authToken = localStorage.getItem("auth_token");
+        if (authToken) {
+          const apiBase = process.env.NEXT_PUBLIC_API_URL || "http://45.93.137.91/api";
+          await fetch(`${apiBase}/Notifications/RegisterWebToken`, {
+            method: "POST",
+            headers: {
+              "Content-Type": "application/json",
+              Authorization: `Bearer ${authToken}`,
+            },
+            body: JSON.stringify({ token }),
+          });
+          console.log("[FCM] Token sent to backend");
+        }
+      } catch (err) {
+        console.error("[FCM] Failed to send token to backend:", err);
+      }
+    }
+
     return token;
   } catch (err) {
     console.error("[FCM] Error getting token:", err);