feat: smart systray Léa (plyer), preflight GPU, fix tests, support qwen3-vl

- Smart systray (pystray+plyer) remplace PyQt5 : notifications toast,
  menu dynamique avec workflows, chat "Que dois-je faire ?", icône colorée
- Preflight GPU : check_machine_ready() + @pytest.mark.gpu dans conftest
- Correction 63 tests cassés → 0 failed (1200 passed)
- Tests VWB obsolètes déplacés vers _a_trier/
- Support qwen3-vl:8b sur GPU (remplace qwen2.5vl:3b)
  - fix images < 32x32 (Ollama panic)
  - fix force_json=False (qwen3-vl incompatible)
  - fix temperature 0.1 (0.0 bloque avec images)
- Fix captor Windows : Key.esc, _get_key_name()
- Fix LeaServerClient : check_connection, list_workflows format
- deploy_windows.py : packaging propre client Windows
- VWB : edges visibles (#607d8b) + fitView automatique

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/integration/test_stream_processor.py

@@ -87,9 +87,9 @@ class TestLiveSessionManager:
         session = mgr.finalize("sess_005")
         assert session.finalized is True
 
-    def test_active_session_count(self):
+    def test_active_session_count(self, tmp_path):
         from agent_v0.server_v1.live_session_manager import LiveSessionManager
-        mgr = LiveSessionManager()
+        mgr = LiveSessionManager(persist_dir=str(tmp_path / "test_sessions"))
         mgr.register_session("a")
         mgr.register_session("b")
         assert mgr.active_session_count == 2