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/Enums/ApplicationType.cs

@@ -0,0 +1,15 @@
+
+namespace PepLib.Enums
+{
+    public enum ApplicationType
+    {
+        None = 0x0,
+        Laser = 0x1,
+        Flame = 0x2,
+        Punch = 0x3,
+        PlasmaPunch = 0x4,
+        Waterjet = 0x6,
+        LaserPunch = 0x7,
+        FlamePlasma = 0x9
+    }
+}

PepLib.Core/Enums/DrawingType.cs

@@ -0,0 +1,12 @@
+
+namespace PepLib.Enums
+{
+    public enum DrawingType
+    {
+        None = 0x20,
+        Drawing = 0x44,
+        Product = 0x50,
+        Rotary = 0x52,
+        Tool = 0x54
+    }
+}

PepLib.Core/Enums/GrainType.cs

@@ -0,0 +1,11 @@
+
+namespace PepLib.Enums
+{
+    public enum GrainType
+    {
+        No = 0x0,
+        Yes = 0x1,
+        Soft = 0x2,
+        Hard = 0x3
+    }
+}

PepLib.Core/Enums/KerfType.cs

@@ -0,0 +1,10 @@
+
+namespace PepLib.Enums
+{
+    public enum KerfType
+    {
+        None,
+        Left,
+        Right
+    }
+}

PepLib.Core/Enums/ProgrammingMode.cs

@@ -0,0 +1,8 @@
+namespace PepLib.Enums
+{
+    public enum ProgrammingMode
+    {
+        Absolute,
+        Incremental
+    }
+}

PepLib.Core/Enums/RotationType.cs

@@ -0,0 +1,16 @@
+
+namespace PepLib.Enums
+{
+    public enum RotationType
+    {
+        /// <summary>
+        /// Clockwise
+        /// </summary>
+        CW,
+
+        /// <summary>
+        /// Counter-Clockwise
+        /// </summary>
+        CCW
+    }
+}

PepLib.Core/Enums/StatusType.cs

@@ -0,0 +1,11 @@
+
+namespace PepLib.Enums
+{
+    public enum StatusType
+    {
+        ToBeCut,
+        Quote,
+        HasBeenCut,
+        Temp
+    }
+}