test: фаза 4 — тесты extractors, ecosystem, i18n, metrics

- test_nexus.py: extract_pypi/go/npm, dispatch, edge cases (16 тестов)
- test_i18n.py: RU/EN переводы, fallback, форматирование, web UI (10 тестов)
- test_metrics.py: Prometheus endpoint (4 теста)
- test_webhooks.py: _detect_ecosystem (6 тестов), Go/npm webhook fixtures
- conftest.py: sample_nexus_go/npm_webhook fixtures
- Всего: 85 тестов (было 50)

tests/test_webhooks.py

@@ -82,3 +82,52 @@ async def test_webhook_component_no_version(client, sample_nexus_component_webho
     resp = await client.post("/webhooks/nexus", json=sample_nexus_component_webhook)
     assert resp.status_code == 200
     assert resp.json()["status"] == "ignored"
+
+
+# --- Ecosystem detection tests ---
+
+def test_detect_ecosystem_pypi():
+    from guarddog_nexus.routes.webhooks import _detect_ecosystem
+
+    assert _detect_ecosystem({"format": "pypi"}) == "pypi"
+    assert _detect_ecosystem({"format": "pip"}) == "pypi"
+    assert _detect_ecosystem({"format": "python"}) == "pypi"
+
+
+def test_detect_ecosystem_go():
+    from guarddog_nexus.routes.webhooks import _detect_ecosystem
+
+    assert _detect_ecosystem({"format": "go"}) == "go"
+    assert _detect_ecosystem({"format": "golang"}) == "go"
+
+
+def test_detect_ecosystem_npm():
+    from guarddog_nexus.routes.webhooks import _detect_ecosystem
+
+    assert _detect_ecosystem({"format": "npm"}) == "npm"
+    assert _detect_ecosystem({"format": "node"}) == "npm"
+
+
+def test_detect_ecosystem_unknown():
+    from guarddog_nexus.routes.webhooks import _detect_ecosystem
+
+    assert _detect_ecosystem({"format": "maven"}) == "maven"
+    assert _detect_ecosystem({}) == "pypi"  # default
+
+
+# --- Go/npm webhook integration ---
+
+@pytest.mark.asyncio
+async def test_webhook_go_asset(client, sample_nexus_go_webhook):
+    with patch("guarddog_nexus.routes.webhooks._scan_in_background") as _mock:
+        resp = await client.post("/webhooks/nexus", json=sample_nexus_go_webhook)
+        assert resp.status_code == 200
+        assert resp.json()["status"] == "accepted"
+
+
+@pytest.mark.asyncio
+async def test_webhook_npm_asset(client, sample_nexus_npm_webhook):
+    with patch("guarddog_nexus.routes.webhooks._scan_in_background") as _mock:
+        resp = await client.post("/webhooks/nexus", json=sample_nexus_npm_webhook)
+        assert resp.status_code == 200
+        assert resp.json()["status"] == "accepted"