fix(settings): do not overlay empty SuperAdmin values onto tenant DB

Blank template values must not wipe local can_edit=0 settings like
price_provider until SuperAdmin actually saves a value for that tenant.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Services/SuperAdminProgramSettingsOverlay.php

@@ -62,6 +62,11 @@ class SuperAdminProgramSettingsOverlay
             if ($key === '' || in_array($key, self::LOCAL_OWNED_KEYS, true) || in_array($key, self::RUNTIME_KEYS, true)) {
                 continue;
             }
+            // مقدار خالی قالب سوپرادمین نباید value لوکال tenant را پاک کند
+            $value = $row['value'] ?? null;
+            if ($value === null || $value === '') {
+                continue;
+            }
             $map[$key] = $row;
         }