refactor: rename all agents and improve structure pt1

ref: N25B-257

test/unit/agents/test_vad_streaming.py

@@ -3,7 +3,7 @@ from unittest.mock import AsyncMock, MagicMock
 import numpy as np
 import pytest
 
-from control_backend.agents.vad_agent import Streaming
+from control_backend.agents.per_agents.per_vad_agent import Streaming
 
 
 @pytest.fixture
@@ -20,7 +20,7 @@ def audio_out_socket():
 def mock_agent(mocker):
     """Fixture to create a mock BDIAgent."""
     agent = MagicMock()
-    agent.jid = "vad_agent@test"
+    agent.jid = "per_vad_agent@test"
     return agent