Implement onboarding reset functionality and enhance backup features

- Added a new method to reset the onboarding state, allowing users to re-initiate the onboarding process.
- Integrated backup creation functionality, enabling users to create encrypted backups of their node identity.
- Updated API endpoints to handle onboarding reset and backup creation requests.
- Enhanced UI components to support the new onboarding reset and backup features, including error handling and user feedback.
- Introduced new dependencies for cryptographic operations and data encoding.

neode-ui/src/views/Login.vue

@@ -116,14 +116,22 @@
         </div>
       </div>
 
-      <!-- Replay Intro - Bottom of Page -->
-      <div class="mt-8 text-center">
+      <!-- Replay Intro / Restart Onboarding - Bottom of Page -->
+      <div class="mt-8 text-center flex items-center justify-center gap-4">
         <button 
           @click="replayIntro" 
           class="text-xs text-white/50 hover:text-white/70 transition-colors underline-offset-2 hover:underline"
         >
           Replay Intro
         </button>
+        <span class="text-white/30">|</span>
+        <button 
+          @click="restartOnboarding" 
+          :disabled="isResettingOnboarding"
+          class="text-xs text-white/50 hover:text-white/70 transition-colors underline-offset-2 hover:underline disabled:opacity-50 disabled:cursor-not-allowed"
+        >
+          {{ isResettingOnboarding ? 'Resetting...' : 'Onboarding' }}
+        </button>
       </div>
     </div>
   </div>
@@ -286,6 +294,27 @@ function replayIntro() {
   // Navigate to root to trigger splash screen
   window.location.href = '/'
 }
+
+const isResettingOnboarding = ref(false)
+
+async function restartOnboarding() {
+  if (isResettingOnboarding.value) return
+  isResettingOnboarding.value = true
+  try {
+    await rpcClient.resetOnboarding()
+    localStorage.removeItem('neode_onboarding_complete')
+    localStorage.removeItem('neode_did')
+    localStorage.removeItem('neode_did_state')
+    localStorage.removeItem('neode_backup_created')
+    await router.push('/onboarding/intro')
+    window.location.reload()
+  } catch (err) {
+    console.error('Failed to reset onboarding:', err)
+    error.value = err instanceof Error ? err.message : 'Failed to reset onboarding'
+  } finally {
+    isResettingOnboarding.value = false
+  }
+}
 </script>
 
 <style scoped>