fix: firmware upload failure

public/scripts/api-client.js

@@ -94,13 +94,19 @@ class ApiClient {
     async uploadFirmware(file, nodeIp) {
         const formData = new FormData();
         formData.append('file', file);
-        return this.request(`/api/node/update`, {
+        const data = await this.request(`/api/node/update`, {
             method: 'POST',
             query: { ip: nodeIp },
             body: formData,
             isForm: true,
             headers: {},
         });
+        // Some endpoints may return HTTP 200 with success=false on logical failure
+        if (data && data.success === false) {
+            const message = data.message || 'Firmware upload failed';
+            throw new Error(message);
+        }
+        return data;
     }
 }