GuestLog - StayEntry - Initial Implementation

- Added new entity "StayEntry" to log stays of guests.
- Added pages for StayEntry management (List and creation).
- New DataList for PaymentMethods.
- Other general changes and improvements.

src/Somnia.GuestLog/Models/DTOs/StayEntryDTO.cs

@@ -0,0 +1,20 @@
+namespace Somnia.GuestLog.Models.DTOs;
+
+public class StayEntryDTO
+{
+    public long? Id { get; set; }
+
+    public DateTime? DateIn { get; set; }
+    public DateTime? DateOut { get; set; }
+
+    public int? RoomCount { get; set; }
+    public string? RoomNumber { get; set; }
+    public string? PaymentMethod { get; set; }
+
+
+    public List<GuestDocumentDTO> GuestDocuments { get; set; } = [];
+
+
+    public DateTime? CreateTime { get; set; }
+    public DateTime? UpdateTime { get; set; }
+}