Adds super user and config setup

Adds super user role to restrict settings changes.

Improves the settings screen to only allow super users to make modifications.

Adds a warning banner if the Castle wallet is not configured.

Changes admin key to inkey for fetching settings.
This fixes an issue where settings weren't accessible.

Adds a validation to require the Castle wallet ID when updating settings.

static/js/index.js

@@ -13,6 +13,8 @@ window.app = Vue.createApp({
       currencies: [],
       settings: null,
       isAdmin: false,
+      isSuperUser: false,
+      castleWalletConfigured: false,
       expenseDialog: {
         show: false,
         description: '',
@@ -104,16 +106,21 @@ window.app = Vue.createApp({
     },
     async loadSettings() {
       try {
+        // Try with admin key first to check settings
         const response = await LNbits.api.request(
           'GET',
           '/castle/api/v1/settings',
-          this.g.user.wallets[0].adminkey
+          this.g.user.wallets[0].inkey
         )
         this.settings = response.data
-        this.isAdmin = true
+        this.castleWalletConfigured = !!(this.settings && this.settings.castle_wallet_id)
+
+        // Check if user is super user by seeing if they can access admin features
+        this.isSuperUser = this.g.user.super_user || false
+        this.isAdmin = this.g.user.admin || this.isSuperUser
       } catch (error) {
-        // Not admin or settings not available
-        this.isAdmin = false
+        // Settings not available
+        this.castleWalletConfigured = false
       }
     },
     showSettingsDialog() {
@@ -121,6 +128,14 @@ window.app = Vue.createApp({
       this.settingsDialog.show = true
     },
     async submitSettings() {
+      if (!this.settingsDialog.castleWalletId) {
+        this.$q.notify({
+          type: 'warning',
+          message: 'Castle Wallet ID is required'
+        })
+        return
+      }
+
       this.settingsDialog.loading = true
       try {
         await LNbits.api.request(