Initial .NET scaffold: Core, Console, WPF projects

Introduced solution structure for AIFotoONLUS migration to .NET. Added Core library with YOLO-based detection/recognition engine using OpenCvSharp, Console batch runner, and WPF demo frontend with MVVM. Implemented model loading, directory processing, progress reporting, and preferences. Added README with build/run instructions.

src/AIFotoONLUS.Console/AIFotoONLUS.Console.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="NLog" Version="6.1.0" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\AIFotoONLUS.Core\AIFotoONLUS.Core.csproj" />
+  </ItemGroup>
+</Project>

src/AIFotoONLUS.Console/Program.cs

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+using AIFotoONLUS.Core;
+using System;
+using System.IO;
+using System.Linq;
+
+namespace AIFotoONLUS.ConsoleApp
+{
+    internal static class Program
+    {
+        private static int Main(string[] args)
+        {
+            if (args.Length == 0)
+            {
+                Console.WriteLine("Usage: AIFotoONLUS.Console -d <directory> -c <output.csv> [-tn|--textnegative]");
+                return 1;
+            }
+
+            string? directory = null;
+            string? csvPath = null;
+            bool textNegative = false;
+
+            for (int i = 0; i < args.Length; i++)
+            {
+                var a = args[i];
+                if (a == "-d" || a == "--directory")
+                {
+                    if (i + 1 < args.Length) directory = args[++i];
+                }
+                else if (a == "-c" || a == "--csv")
+                {
+                    if (i + 1 < args.Length) csvPath = args[++i];
+                }
+                else if (a == "-tn" || a == "--textnegative")
+                {
+                    textNegative = true;
+                }
+            }
+
+            if (string.IsNullOrEmpty(directory) || string.IsNullOrEmpty(csvPath))
+            {
+                Console.WriteLine("Missing required arguments.");
+                return 1;
+            }
+
+            if (!Directory.Exists(directory))
+            {
+                Console.WriteLine($"Directory not found: {directory}");
+                return 1;
+            }
+
+            var cfg = new ModelConfiguration
+            {
+                DetectionCfg = Path.Combine("models", "detection.cfg"),
+                DetectionWeights = Path.Combine("models", "detection.weights"),
+                RecognitionCfg = Path.Combine("models", "recognition.cfg"),
+                RecognitionWeights = Path.Combine("models", "recognition.weights"),
+                ConfidenceThreshold = 0.5,
+                NmsThreshold = 0.4
+            };
+
+            try
+            {
+                using var engine = new NumberRecognitionEngine(cfg);
+                var results = engine.ProcessDirectory(directory, textNegative).ToList();
+
+                using var sw = new StreamWriter(csvPath, false);
+                sw.WriteLine("filename,text");
+                foreach (var r in results)
+                {
+                    sw.WriteLine($"{r.FileName},{r.Text}");
+                }
+
+                Console.WriteLine($"Results written to {csvPath}");
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"Error: {ex.Message}");
+                return 2;
+            }
+
+            return 0;
+        }
+    }
+}