feat: adiciona Silero VAD local com configuração por ambiente

config/development.yaml

@@ -17,3 +17,10 @@ agent:
   provider: mock
   options: {}
 
+vad:
+  provider: silero
+  options:
+    threshold: 0.5
+    min_silence_duration_ms: 300
+    speech_pad_ms: 30
+    worker_timeout_seconds: 10.0

config/providers.yaml

@@ -39,4 +39,13 @@ providers:
       implementation: "voice_assistant.agent.deep_agent:DeepAgentsAdapter"
       capabilities:
         realtime: true
-        streaming: true
+        streaming: true
+
+  vad:
+
+    silero:
+      name: "Silero VAD"
+      implementation: "voice_assistant.vad.silero:SileroVADAdapter"
+      capabilities:
+        realtime: true
+        streaming: true