refactor(PepLib.Core): reorganize files into logical folder structure

Move 38 files from root directory into organized subfolders:
- Enums/ (7 files): StatusType, ApplicationType, DrawingType, etc.
- Geometry/ (5 files): Vector, Box, Size, Spacing, Node
- Models/ (15 files): Nest, Plate, Part, Program, Report, etc.
- Utilities/ (7 files): MathHelper, Tolerance, ZipHelper, etc.
- Extensions/ (2 files): PartListExtensions, PlateListExtensions
- Interfaces/ (1 file): IMovable

Update namespaces to follow folder hierarchy (e.g., PepLib.Models).
Add GlobalUsings.cs for internal backward compatibility.
Update Codes/ and IO/ files with new using statements.
Update PepApi.Core consumers to reference new namespaces.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

PepLib.Core/Models/Report.cs

@@ -0,0 +1,121 @@
+using PepLib.IO;
+
+namespace PepLib.Models
+{
+    public partial class Report
+    {
+        public Report()
+        {
+            Drawings = new List<Report.Drawing>();
+            Plates = new List<Report.Plate>();
+        }
+
+        public List<Report.Drawing> Drawings { get; set; }
+
+        public List<Report.Plate> Plates { get; set; }
+
+        public string Name { get; set; }
+
+        public string Customer { get; set; }
+
+        public DateTime DateProgrammed { get; set; }
+
+        public string Material { get; set; }
+
+        public string ProgrammedBy { get; set; }
+
+        public string Machine { get; set; }
+
+        public string Comments { get; set; }
+
+        public string Remarks { get; set; }
+
+        public TimeSpan TotalCutTime { get; set; }
+
+        public double TotalGasUsed { get; set; }
+
+        public double TotalRapidDistance { get; set; }
+
+        public int TotalHeadRaises { get; set; }
+
+        public double CutFeedrate { get; set; }
+
+        public double RapidFeedrate { get; set; }
+
+        public TimeSpan PierceTime { get; set; }
+
+        public int PlateCount()
+        {
+            return Plates.Sum(plate => plate.Quantity);
+        }
+
+        public int ProgramCount()
+        {
+            return Plates.Count;
+        }
+
+        public double CutDistance()
+        {
+            return Drawings.Sum(dwg => dwg.CutDistance);
+        }
+
+        public double ScribeDistance()
+        {
+            return Drawings.Sum(dwg => dwg.ScribeDistance);
+        }
+
+        public double BevelDistance()
+        {
+            return Drawings.Sum(dwg => dwg.BevelDistance);
+        }
+
+        public int TotalPierceCount()
+        {
+            return Drawings.Sum(dwg => dwg.PierceCount);
+        }
+
+        public static Report Load(string nestFile)
+        {
+            var reader = new ReportReader();
+            reader.Read(nestFile);
+            return reader.Report;
+        }
+
+        public static Report Load(Stream stream)
+        {
+            var reader = new ReportReader();
+            reader.Read(stream);
+            return reader.Report;
+        }
+
+        public static bool TryLoad(string nestfile, out Report report)
+        {
+            try
+            {
+                report = Load(nestfile);
+            }
+            catch (Exception)
+            {
+                report = null;
+                return false;
+            }
+
+            return true;
+        }
+
+        public static bool TryLoad(Stream stream, out Report report)
+        {
+            try
+            {
+                report = Load(stream);
+            }
+            catch (Exception)
+            {
+                report = null;
+                return false;
+            }
+
+            return true;
+        }
+    }
+}