Initial commit: ClawdDotNet

Import des bestehenden Projektstands in Git.
- .NET 10 WinForms Anwendung (Multi-Agent / Tool-System)
- .gitignore fuer Build-Artefakte, Secrets und Runtime-Daten ergaenzt

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/ClawdDotNet.Core/Api/Models/ChatRequest.cs

@@ -0,0 +1,32 @@
+using System.Text.Json.Serialization;
+
+namespace ClawdDotNet.Core.Api.Models;
+
+public sealed class ChatRequest
+{
+    [JsonPropertyName("model")]
+    public string Model { get; set; } = "";
+
+    [JsonPropertyName("messages")]
+    public List<ChatMessage> Messages { get; set; } = new();
+
+    [JsonPropertyName("tools")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    public List<ToolDefinition>? Tools { get; set; }
+
+    [JsonPropertyName("tool_choice")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    public string? ToolChoice { get; set; }
+
+    [JsonPropertyName("temperature")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    public double? Temperature { get; set; }
+
+    [JsonPropertyName("max_tokens")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    public int? MaxTokens { get; set; }
+
+    [JsonPropertyName("stream")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
+    public bool Stream { get; set; }
+}