Add support for ollama (#34)

app/MindWork AI Studio/Provider/SelfHosted/Host.cs

@@ -0,0 +1,42 @@
+namespace AIStudio.Provider.SelfHosted;
+
+public enum Host
+{
+    NONE,
+
+    LM_STUDIO,
+    LLAMACPP,
+    OLLAMA,
+}
+
+public static class HostExtensions
+{
+    public static string Name(this Host host) => host switch
+    {
+        Host.NONE => "None",
+
+        Host.LM_STUDIO => "LM Studio",
+        Host.LLAMACPP => "llama.cpp",
+        Host.OLLAMA => "ollama",
+
+        _ => "Unknown",
+    };
+
+    public static string BaseURL(this Host host) => host switch
+    {
+        Host.LM_STUDIO => "/v1/",
+        Host.LLAMACPP => "/v1/",
+        Host.OLLAMA => "/v1/",
+
+        _ => "/v1/",
+    };
+
+    public static string ChatURL(this Host host) => host switch
+    {
+        Host.LM_STUDIO => "chat/completions",
+        Host.LLAMACPP => "chat/completions",
+        Host.OLLAMA => "chat/completions",
+
+        _ => "chat/completions",
+    };
+}