Add optional Project Name field to quotes, jobs, and printed documents

- Add ProjectName (nvarchar 100, nullable) to Quote and Job entities;
  migration AddProjectNameToQuotesAndJobs applied
- Add ProjectName to all relevant DTOs: QuoteDto/Create/Update,
  JobDto/List/Create/Update, InvoiceDto (mapped from Job.ProjectName
  via AutoMapper so the invoice PDF picks it up without a separate column)
- Form field added after Customer PO in Quote Create/Edit and Job Create/Edit
- CreateJobFromQuote copies ProjectName from quote to job automatically
- Details views (Quote and Job) display Project when set
- Printable quote PDF: Project row in the quote details block
- Work order: Project row in customer/job info section
- Invoice PDF: Project shown in the Job Reference block alongside Job # and PO #

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

src/PowderCoating.Web/Views/Jobs/WorkOrder.cshtml

@@ -357,6 +357,13 @@
                         <div class="info-value">@Model.CustomerPO</div>
                     </div>
                 }
+                @if (!string.IsNullOrWhiteSpace(Model.ProjectName))
+                {
+                    <div class="info-row">
+                        <div class="info-label">Project</div>
+                        <div class="info-value">@Model.ProjectName</div>
+                    </div>
+                }
             </div>
             <div class="col-6">
                 <div class="section-title">