Add inventory bin filter, print bin, mobile login fixes, and QR scan fix

- Inventory: location filter dropdown + Print Bin page (line #, name, color, SKU)
- Fix: Prismatic Powders QR scan now extracts manufacturer/SKU/color from URL path
  and uses full LookupAsync pipeline instead of relying on page fetch alone
- Fix: iOS Safari 'Login / data Zero KB' download -- add OnRejected HTML response to rate limiter
- Fix: mobile session logout -- ConfigureApplicationCookie with 30-day MaxAge persistent cookie
- Help: new 'Location Filtering & Bin Print' section in Inventory help article
- Help: HelpKnowledgeBase updated with bin filter and print bin details

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

src/PowderCoating.Application/DTOs/Inventory/InventoryDtos.cs

@@ -68,6 +68,7 @@ public class InventoryListDto
     public string? CategoryName { get; set; }
     public string Category { get; set; } = string.Empty; // Legacy field
     public string? ColorName { get; set; }
+    public string? Location { get; set; }
     public decimal QuantityOnHand { get; set; }
     public string UnitOfMeasure { get; set; } = "lbs";
     public decimal ReorderPoint { get; set; }