feat: add ticket solution closure loop

backend/apps/solutions/tests/test_solution_api.py

@@ -39,3 +39,30 @@ def test_link_solution_to_ticket_increments_usage(admin_client, db):
     assert response.status_code == 200
     assert response.json()["link_type"] == "adopted"
     assert response.json()["solution_usage_count"] == 1
+
+
+def test_list_ticket_solutions_returns_linked_solution_details(admin_client, db):
+    ticket = Ticket.objects.create(ticket_no="TK202607020001", title="A", description="A")
+    solution = admin_client.post(
+        "/api/solutions",
+        data={
+            "title": "Restart callback worker",
+            "problem_signature": "Callback timeout",
+            "root_cause": "Worker queue blocked",
+            "solution": "Restart worker and verify queue depth.",
+            "status": "published",
+        },
+        content_type="application/json",
+    ).json()
+    admin_client.post(
+        f"/api/solutions/{solution['id']}/link-ticket",
+        data={"ticket_id": ticket.id, "link_type": "adopted"},
+        content_type="application/json",
+    )
+
+    response = admin_client.get(f"/api/solutions/tickets/{ticket.id}")
+
+    assert response.status_code == 200
+    payload = response.json()
+    assert payload[0]["link_type"] == "adopted"
+    assert payload[0]["solution"]["title"] == "Restart callback worker"