Add passkey prompt dismissal and consolidate company admin navigation

- Add "Don't ask me again" to passkey enrollment prompt (PasskeyPromptDismissed
  field on ApplicationUser; DismissPrompt POST action; migration applied)
- Add Subscription & Features button to Companies/Index btn-group and
  Companies/Edit header for direct navigation to SubscriptionManagement/Manage
- Add Edit Company back-link on SubscriptionManagement/Manage
- Remove duplicate AI Features section from Companies/Edit (managed exclusively
  via Subscription & Features page)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/PowderCoating.Web/Views/SubscriptionManagement/Manage.cshtml

@@ -25,6 +25,10 @@
         <a asp-action="Index" class="btn btn-outline-secondary btn-sm">
             <i class="bi bi-arrow-left me-1"></i>Back
         </a>
+        <a asp-controller="Companies" asp-action="Edit" asp-route-id="@Model.Id"
+           class="btn btn-outline-secondary btn-sm">
+            <i class="bi bi-building me-1"></i>Edit Company
+        </a>
         <h4 class="mb-0">
             <i class="bi bi-credit-card me-2 text-primary"></i>@Model.CompanyName
         </h4>