fix: use check_user_exists for LNbits 1.4 compatibility

LNbits 1.4 changed check_super_user to return Account (no wallets)
instead of User (with wallets). This broke the template rendering
because LNbits.map.user() requires the wallets property.

Switch to check_user_exists (returns User with wallets) and manually
check user.super_user for access control. This follows the same
pattern used by LNbits core admin pages.

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

views.py

@@ -1,9 +1,11 @@
 # Description: DCA Admin page endpoints.
 
-from fastapi import APIRouter, Depends, Request
+from http import HTTPStatus
+
+from fastapi import APIRouter, Depends, HTTPException, Request
 from fastapi.responses import HTMLResponse
 from lnbits.core.models import User
-from lnbits.decorators import check_super_user
+from lnbits.decorators import check_user_exists
 from lnbits.helpers import template_renderer
 
 satmachineadmin_generic_router = APIRouter()
@@ -15,7 +17,11 @@ def satmachineadmin_renderer():
 
 # DCA Admin page - Requires superuser access
 @satmachineadmin_generic_router.get("/", response_class=HTMLResponse)
-async def index(req: Request, user: User = Depends(check_super_user)):
+async def index(req: Request, user: User = Depends(check_user_exists)):
+    if not user.super_user:
+        raise HTTPException(
+            HTTPStatus.FORBIDDEN, "User not authorized. No super user privileges."
+        )
     return satmachineadmin_renderer().TemplateResponse(
         "satmachineadmin/index.html", {"request": req, "user": user.json()}
     )