Fix super user bypass and show virtual accounts in admin UI

Two related fixes for account access:

1. **Super user bypass for permission filtering**
   - Super users now bypass permission checks and see all accounts
   - Fixes issue where Castle system account was blocked from seeing accounts
   - Regular users still get filtered by permissions as expected

2. **Show virtual accounts in permissions management UI**
   - Permissions page now passes exclude_virtual=false
   - Admins need to see virtual accounts to grant permissions on them
   - Enables granting permission on 'Expenses:Supplies' to give access to all children

Impact:
- Super user can now create entries and see all accounts ✓
- Admins can grant permissions on virtual parent accounts ✓
- Regular users still only see permitted, non-virtual accounts ✓
- Permission inheritance works correctly for all users ✓

🤖 Generated with Claude Code (https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

static/js/permissions.js

@@ -155,9 +155,10 @@ window.app = Vue.createApp({
 
     async loadAccounts() {
       try {
+        // Admin permissions UI needs to see virtual accounts to grant permissions on them
         const response = await LNbits.api.request(
           'GET',
-          '/castle/api/v1/accounts',
+          '/castle/api/v1/accounts?exclude_virtual=false',
           this.g.user.wallets[0].inkey
         )
         this.accounts = response.data