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.Core/Entities/Job.cs

@@ -47,6 +47,7 @@ public class Job : BaseEntity
 
     // Additional Information
     public string? CustomerPO { get; set; }
+    public string? ProjectName { get; set; }
     public string? SpecialInstructions { get; set; }
     public string? InternalNotes { get; set; }  // Internal notes from quote
     public string? Tags { get; set; }