Add AI Profile draft generator and hide AI Quick Quote for release

- GenerateAiProfileDraft endpoint builds suggested AI Profile text from
  existing company config (ovens, workers, inventory categories, rates)
- "Generate from my settings" button wired in Company Settings AI Profile tab
- Add "hrs" unit label to Billable Hours/Month input in Company Settings and Setup Wizard Step 3
- Hide AI Quick Quote widget (commented out in _Layout) pending next release

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

src/PowderCoating.Web/Views/Shared/_Layout.cshtml

@@ -2089,7 +2089,7 @@
 
     @if (User.Identity?.IsAuthenticated == true)
     {
-        @await Html.PartialAsync("_AiQuickQuoteWidget")
+        @* @await Html.PartialAsync("_AiQuickQuoteWidget") *@
         @await Html.PartialAsync("_AiHelpWidget")
     }