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/Edit.cshtml

@@ -101,6 +101,10 @@
                         <label asp-for="CustomerPO" class="form-label">Customer PO</label>
                         <input asp-for="CustomerPO" class="form-control" placeholder="Enter PO number" />
                     </div>
+                    <div class="col-md-6">
+                        <label asp-for="ProjectName" class="form-label">Project Name</label>
+                        <input asp-for="ProjectName" class="form-control" placeholder="e.g. Kitchen Remodel, Fleet Vehicle #3&hellip;" />
+                    </div>
                     <div class="col-md-7">
                         <label asp-for="SpecialInstructions" class="form-label">Special Instructions</label>
                         <textarea asp-for="SpecialInstructions" class="form-control" rows="3" placeholder="Any special instructions"></textarea>