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.go

@@ -372,6 +372,66 @@ func (s *ExplorationStore) Edges(limit int) ([]Edge, error) {
 	return out, rows.Err()
 }
 
+// FindingLineage returns the sub-DAG that leads FROM the exploration root TO the
+// given node: the node itself plus all its ancestors (nodes reverse-reachable by
+// following edges backward), and every edge whose both endpoints are in that set.
+// Used to render "how this finding was reached" — origin → … → finding. Returns
+// empty (not error) for a nonexistent node.
+func (s *ExplorationStore) FindingLineage(nodeID int64) ([]*Node, []Edge, error) {
+	// anc = the node + everything that can reach it via edges (walk src<-dst).
+	nodeRows, err := s.db.Query(`
+WITH RECURSIVE anc(id) AS (
+    SELECT $2::bigint
+  UNION
+    SELECT e.src_id
+    FROM exploration_edges e
+    JOIN anc ON e.dst_id = anc.id
+    WHERE e.exploration_id = $1
+)
+SELECT `+nodeCols+`
+FROM exploration_nodes
+WHERE exploration_id = $1 AND id IN (SELECT id FROM anc)
+ORDER BY id`, s.expID, nodeID)
+	if err != nil {
+		return nil, nil, err
+	}
+	nodes, err := scanNodes(nodeRows)
+	if err != nil {
+		return nil, nil, err
+	}
+	if len(nodes) == 0 {
+		return nil, nil, nil
+	}
+	// edges among the ancestor set only (the lineage's internal relations).
+	edgeRows, err := s.db.Query(`
+WITH RECURSIVE anc(id) AS (
+    SELECT $2::bigint
+  UNION
+    SELECT e.src_id
+    FROM exploration_edges e
+    JOIN anc ON e.dst_id = anc.id
+    WHERE e.exploration_id = $1
+)
+SELECT src_id, rel, dst_id
+FROM exploration_edges
+WHERE exploration_id = $1
+  AND src_id IN (SELECT id FROM anc)
+  AND dst_id IN (SELECT id FROM anc)`, s.expID, nodeID)
+	if err != nil {
+		return nil, nil, err
+	}
+	defer edgeRows.Close()
+	var edges []Edge
+	for edgeRows.Next() {
+		var e Edge
+		if err := edgeRows.Scan(&e.From, &e.Rel, &e.To); err != nil {
+			return nil, nil, err
+		}
+		edges = append(edges, e)
+	}
+	return nodes, edges, edgeRows.Err()
+}
+
 // FindingIntents maps each finding id to the intent that produced it (the
 // intent --yields--> finding edge; report_finding links it). Findings with no
 // producing intent are absent. Precise (JOIN, no edge-scan limit).