Refactors Castle user retrieval

Simplifies the API endpoint for retrieving Castle users.

Instead of gathering users from various sources (accounts,
permissions, equity), it now focuses on users who have configured
their wallet settings, streamlining the process and aligning with
the intended use case.

views_api.py

@@ -1344,58 +1344,28 @@ async def api_get_castle_users(
     wallet: WalletTypeInfo = Depends(require_admin_key),
 ) -> list[dict]:
     """
-    Get all users who have Castle accounts (receivables, payables, equity, or permissions).
-    This returns only users who are actively using Castle, not all LNbits users.
+    Get all users who have configured their wallet in Castle.
+    These are users who can interact with Castle (submit expenses, receive permissions, etc.).
     Admin only.
     """
     from lnbits.core.crud.users import get_user
-    from .crud import get_all_equity_eligible_users
 
-    # Get all user-specific accounts (Receivable/Payable/Equity)
-    all_accounts = await get_all_accounts()
-    user_accounts = [acc for acc in all_accounts if acc.user_id is not None]
+    # Get all users who have configured their wallet
+    user_settings = await get_all_user_wallet_settings()
 
-    # Get all users who have permissions
-    all_permissions = []
-    for account in all_accounts:
-        account_perms = await get_account_permissions(account.id)
-        all_permissions.extend(account_perms)
-
-    # Get all equity-eligible users
-    equity_users = await get_all_equity_eligible_users()
-
-    # Collect unique user IDs
-    user_ids = set()
-
-    # Add users with accounts
-    for acc in user_accounts:
-        user_ids.add(acc.user_id)
-
-    # Add users with permissions
-    for perm in all_permissions:
-        user_ids.add(perm.user_id)
-
-    # Add equity-eligible users
-    for equity in equity_users:
-        user_ids.add(equity.user_id)
-
-    # Build user list with enriched data
     users = []
-    for user_id in user_ids:
+    for setting in user_settings:
         # Get user details from core
-        user = await get_user(user_id)
+        user = await get_user(setting.id)
 
         # Use username if available, otherwise use user_id
         username = user.username if user and user.username else None
 
-        # Get user's wallet setting if exists
-        user_wallet = await get_user_wallet(user_id)
-
         users.append({
-            "id": user_id,
-            "user_id": user_id,  # Compatibility with existing code
+            "id": setting.id,
+            "user_id": setting.id,  # Compatibility with existing code
             "username": username,
-            "user_wallet_id": user_wallet.user_wallet_id if user_wallet else None,
+            "user_wallet_id": setting.user_wallet_id,
         })
 
     # Sort by username (None values last)