feat(vwb): add dashboard competence testing and health tools

tests/conftest.py

@@ -67,6 +67,41 @@ except ModuleNotFoundError:
     flask_socketio.emit = _fake_emit
     sys.modules["flask_socketio"] = flask_socketio
 
+try:
+    import prometheus_client  # noqa: F401
+except ModuleNotFoundError:
+    prometheus_client = types.ModuleType("prometheus_client")
+    prometheus_client.CONTENT_TYPE_LATEST = "text/plain; version=0.0.4"
+
+    def _fake_generate_latest(*_args, **_kwargs):
+        return b""
+
+    class _FakeMetric:
+        def __init__(self, *_args, **_kwargs):
+            pass
+
+        def labels(self, **_kwargs):
+            return self
+
+        def inc(self, *_args, **_kwargs):
+            return None
+
+        def observe(self, *_args, **_kwargs):
+            return None
+
+        def set(self, *_args, **_kwargs):
+            return None
+
+        def info(self, *_args, **_kwargs):
+            return None
+
+    prometheus_client.generate_latest = _fake_generate_latest
+    prometheus_client.Counter = _FakeMetric
+    prometheus_client.Histogram = _FakeMetric
+    prometheus_client.Gauge = _FakeMetric
+    prometheus_client.Info = _FakeMetric
+    sys.modules["prometheus_client"] = prometheus_client
+
 
 # =============================================================================
 # GPU Preflight — vérification avant les tests GPU