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.Application/Mappings/InvoiceProfile.cs

@@ -19,6 +19,7 @@ public class InvoiceProfile : Profile
 
         CreateMap<Invoice, InvoiceDto>()
             .ForMember(d => d.JobNumber, o => o.MapFrom(s => s.Job != null ? s.Job.JobNumber : string.Empty))
+            .ForMember(d => d.ProjectName, o => o.MapFrom(s => s.Job != null ? s.Job.ProjectName : null))
             .ForMember(d => d.CustomerName, o => o.MapFrom(s => s.Customer != null
                 ? (s.Customer.IsCommercial
                     ? s.Customer.CompanyName