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/SetupWizard/Step3.cshtml

@@ -88,7 +88,10 @@
                     </div>
                     <div class="col-md-4">
                         <label asp-for="MonthlyBillableHours" class="form-label fw-semibold"></label>
-                        <input asp-for="MonthlyBillableHours" class="form-control wz-overhead" step="1" type="number" min="1" />
+                        <div class="input-group">
+                            <input asp-for="MonthlyBillableHours" class="form-control wz-overhead" step="1" type="number" min="1" />
+                            <span class="input-group-text">hrs</span>
+                        </div>
                         <div class="form-text">Hours per month the shop is actively producing work. Default: 160 (4 wks × 40 hrs).</div>
                     </div>
                     <div class="col-md-4">