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/Details.cshtml

@@ -172,6 +172,13 @@
                                 <label class="text-muted small mb-1">Customer PO</label>
                                 <p class="mb-0">@(Model.CustomerPO ?? "Not provided")</p>
                             </div>
+                            @if (!string.IsNullOrEmpty(Model.ProjectName))
+                            {
+                                <div class="col-md-6">
+                                    <label class="text-muted small mb-1">Project</label>
+                                    <p class="mb-0">@Model.ProjectName</p>
+                                </div>
+                            }
                             <div class="col-12">
                                 <label class="text-muted small mb-1">Description</label>
                                 <p class="mb-0">@Model.Description</p>