feat: Implement a modular skill system with hotword detection, streaming text output, and enhanced logging.

Core/Skills/TranslateSkill.cs

@@ -0,0 +1,23 @@
+namespace Toak.Core.Skills;
+
+public class TranslateSkill : ISkill
+{
+    public string Name => "Translate";
+    public string Description => "Translates the spoken text into another language on the fly.";
+    public string[] Hotwords => new[] { "System translate to", "System translate into" };
+
+    public bool HandlesExecution => false;
+
+    public string GetSystemPrompt(string rawTranscript)
+    {
+        return @"You are an expert translator. The user wants to translate the following text.
+The first few words identify the target language (e.g. 'Translate to Spanish:', 'Translate into Hungarian:').
+Translate the REST of the transcript into that target language.
+Output ONLY the final translated text. Do not include markdown, explanations, or quotes.";
+    }
+
+    public void Execute(string llmResult)
+    {
+        // Not used since HandlesExecution is false
+    }
+}