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/Utilities/IniConfig.cs

@@ -0,0 +1,100 @@
+using PepLib.Geometry;
+
+namespace PepLib.Utilities
+{
+    public class IniConfig
+    {
+        public List<Node> Nodes;
+
+        public IniConfig()
+        {
+            Nodes = new List<Node>();
+        }
+
+        private static int LeadingWhitespaceCount(string s)
+        {
+            for (int i = 0; i < s.Length; ++i)
+                if (s[i] != ' ') return i;
+
+            return 0;
+        }
+
+        public Node FindNode(string path)
+        {
+            return FindNode(path, Nodes);
+        }
+
+        private Node FindNode(string path, List<Node> nodes)
+        {
+            var a = path.Split('/');
+
+            var b = nodes.FirstOrDefault(node =>
+            {
+                if (node is KeyNode)
+                {
+                    var c = node as KeyNode;
+                    return c.Name.ToUpper() == a[0].ToUpper();
+                }
+                else
+                {
+                    return node.Value == a[0].Trim();
+                }
+            });
+
+            string path2 = string.Empty;
+
+            for (int i = 1; i < a.Length; ++i)
+                path2 += a[i] + '/';
+
+            if (b == null || a.Length == 1)
+                return b;
+            else
+                return FindNode(path2.TrimEnd('/'), b.Children);
+        }
+
+        public static IniConfig Load(string file)
+        {
+            var doc = new IniConfig();
+            var reader = new StreamReader(file);
+
+            Node currentNode = null;
+            string line;
+
+            while ((line = reader.ReadLine()) != null)
+            {
+                int spaces = LeadingWhitespaceCount(line) / 2;
+                var node = new Node();
+                node.Value = line.Trim();
+
+                var keyNode = KeyNode.Parse(node);
+
+                if (keyNode != null)
+                    node = keyNode;
+
+                int currentdepth = currentNode != null ? currentNode.Level : 0;
+
+                if (spaces == 0)
+                    doc.Nodes.Add(node);
+                else if (spaces == currentdepth)
+                    currentNode.Parent.AddChild(node);
+                else if (spaces > currentdepth)
+                    currentNode.AddChild(node);
+                else if (spaces < currentdepth)
+                {
+                    var n = currentNode.Parent;
+
+                    while (spaces < n.Level)
+                        n = n.Parent;
+
+                    n.Parent.AddChild(node);
+                }
+
+                currentNode = node;
+            }
+
+            reader.Close();
+
+            return doc;
+        }
+    }
+}