feat: host display_name в ingest, поиск хостов, UI и docs

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/tests/test_hosts.py

@@ -0,0 +1,26 @@
+"""Hosts list API."""
+
+from datetime import datetime, timezone
+
+from app.models import Host
+
+
+def test_hosts_search_by_display_name(client, db_session, jwt_headers):
+    h = Host(
+        hostname="pc-01",
+        display_name="UNMS Kalina",
+        os_family="linux",
+        product="ssh-monitor",
+        last_seen_at=datetime.now(timezone.utc),
+    )
+    db_session.add(h)
+    db_session.commit()
+
+    r = client.get("/api/v1/hosts?hostname=UNMS", headers=jwt_headers)
+    assert r.status_code == 200
+    body = r.json()
+    assert body["total"] == 1
+    assert body["items"][0]["display_name"] == "UNMS Kalina"
+
+    r2 = client.get("/api/v1/hosts?hostname=nomatch", headers=jwt_headers)
+    assert r2.json()["total"] == 0