feat: 漏洞详情页删除证据/元数据 Tab,新增「链路图」

链路图展示该漏洞所属任务探索图里,从初始节点(任务根)追溯到本漏洞节点的
那条链路:漏洞节点 + 其全部祖先(沿边反向可达)+ 之间的关系边。

- db.ExplorationStore.FindingLineage(nodeID):递归 CTE 取祖先子图(节点+边),
  下游(如 finding→proves→goal)与无关节点不纳入
- GET /api/exploration/findings/{id}/lineage:解析 finding 的 node_id/task_id →
  返回 {nodes,edges};无节点/任务已删 → 空图
- 前端 api.findingLineage;详情页 Tab 改为「概览 / 链路图」
- lineage.tsx:按深度拓扑排序,自根到漏洞纵向展示节点卡片 + 入边关系标注,
  漏洞节点高亮
- db 测试补 FindingLineage 断言(含祖先/排除下游 goal/排除无关意图)

go build / db / server 测试通过。

db/exploration_test.go

@@ -63,6 +63,27 @@ func TestExplorationFlow(t *testing.T) {
 		t.Fatal(err)
 	}
 
+	// lineage: ancestors of the finding traced backward — here {i2, find} joined by
+	// the yields edge. The proves→goal edge is DOWNSTREAM (goal must be excluded),
+	// and the unrelated intent i1 is not on any path to the finding (excluded too).
+	lnNodes, lnEdges, err := es.FindingLineage(find)
+	if err != nil {
+		t.Fatal(err)
+	}
+	got := map[int64]bool{}
+	for _, n := range lnNodes {
+		got[n.ID] = true
+	}
+	if len(lnNodes) != 2 || !got[find] || !got[i2] {
+		t.Fatalf("lineage nodes: want {i2,find}, got %+v", lnNodes)
+	}
+	if got[goal] {
+		t.Fatalf("lineage must exclude the proved goal (it is downstream of the finding)")
+	}
+	if len(lnEdges) != 1 || lnEdges[0].From != i2 || lnEdges[0].To != find || lnEdges[0].Rel != "yields" {
+		t.Fatalf("lineage edges: want i2-yields->find, got %+v", lnEdges)
+	}
+
 	// activity poll by id cursor
 	id1, err := es.AppendActivity(Activity{Worker: "worker-1", Kind: "tool_use", Tool: "Bash", Summary: "ran curl", Detail: "full output"})
 	if err != nil {