fix(ui): 任务总览的测试范围显示企业名称而非 ID

/api/tasks/{id}/scope 只返回 company_id，前端无从解析名称，测试范围里的
企业行只能渲染成 "company #4"。

- TaskScope 增加 company_name，ListTaskScope 与 ListTaskScopeWithSources
  都 LEFT JOIN companies 带出名称（LEFT 而非 INNER：域名/IP/网段行的
  company_id 为 NULL，内连接会把它们全过滤掉）
- 两个查询函数都改，避免结构体字段"一个填一个不填"的不一致
- 前端优先显示名称，公司被删后的残留行仍以「企业 #N」兜底

覆盖图谱的企业节点本就查名显示（task_scope.go 的 BuildCoverageGraph），
不受影响。

Claude-Session: https://claude.ai/code/session_01Q8nhYZfS4H8fsSCBJXxbSy

db/task_assets_context.go

@@ -52,10 +52,11 @@ tested AS (
 // scopes of its direct source tasks. TaskScope.TaskID preserves provenance.
 func (s *AssetStore) ListTaskScopeWithSources(taskID int64) ([]TaskScope, error) {
 	rows, err := s.db.Query(`WITH `+directTaskContextCTE+`
-SELECT ts.id, ts.task_id, ts.kind, COALESCE(ts.company_id,0), COALESCE(ts.domain,''),
+SELECT ts.id, ts.task_id, ts.kind, COALESCE(ts.company_id,0), COALESCE(c.name,''), COALESCE(ts.domain,''),
        COALESCE(ts.net::text,''), ts.source, COALESCE(ts.reason,'')
 FROM task_scope ts
 JOIN context_tasks ctx ON ctx.task_id=ts.task_id
+LEFT JOIN companies c ON c.id=ts.company_id
 ORDER BY CASE WHEN ts.task_id=$1 THEN 0 ELSE 1 END, ts.id`, taskID)
 	if err != nil {
 		return nil, err
@@ -65,7 +66,7 @@ ORDER BY CASE WHEN ts.task_id=$1 THEN 0 ELSE 1 END, ts.id`, taskID)
 	for rows.Next() {
 		var scope TaskScope
 		var companyID int64
-		if err := rows.Scan(&scope.ID, &scope.TaskID, &scope.Kind, &companyID, &scope.Domain, &scope.Net, &scope.Source, &scope.Reason); err != nil {
+		if err := rows.Scan(&scope.ID, &scope.TaskID, &scope.Kind, &companyID, &scope.CompanyName, &scope.Domain, &scope.Net, &scope.Source, &scope.Reason); err != nil {
 			return nil, err
 		}
 		if companyID > 0 {

db/task_scope.go

@@ -16,10 +16,13 @@ type TaskScope struct {
 	TaskID    int64  `json:"task_id"`
 	Kind      string `json:"kind"` // company|root_domain|subdomain|ip|cidr
 	CompanyID *int64 `json:"company_id,omitempty"`
-	Domain    string `json:"domain,omitempty"`
-	Net       string `json:"net,omitempty"`
-	Source    string `json:"source"`
-	Reason    string `json:"reason,omitempty"`
+	// CompanyName is resolved for kind=company so callers can label a scope row
+	// without a second lookup. Empty when the row is not a company reference.
+	CompanyName string `json:"company_name,omitempty"`
+	Domain      string `json:"domain,omitempty"`
+	Net         string `json:"net,omitempty"`
+	Source      string `json:"source"`
+	Reason      string `json:"reason,omitempty"`
 }
 
 // stripHostPort drops a trailing :port from a host:port / ip:port / [ipv6]:port
@@ -202,8 +205,11 @@ func (s *AssetStore) DeleteTaskScope(taskID, scopeID int64) (bool, error) {
 // ListTaskScope returns all scope rows for a task.
 func (s *AssetStore) ListTaskScope(taskID int64) ([]TaskScope, error) {
 	rows, err := s.db.Query(`
-SELECT id, kind, COALESCE(company_id,0), COALESCE(domain,''), COALESCE(net::text,''), source, COALESCE(reason,'')
-FROM task_scope WHERE task_id=$1 ORDER BY id`, taskID)
+SELECT ts.id, ts.kind, COALESCE(ts.company_id,0), COALESCE(c.name,''), COALESCE(ts.domain,''),
+       COALESCE(ts.net::text,''), ts.source, COALESCE(ts.reason,'')
+FROM task_scope ts
+LEFT JOIN companies c ON c.id=ts.company_id
+WHERE ts.task_id=$1 ORDER BY ts.id`, taskID)
 	if err != nil {
 		return nil, err
 	}
@@ -212,7 +218,7 @@ FROM task_scope WHERE task_id=$1 ORDER BY id`, taskID)
 	for rows.Next() {
 		var t TaskScope
 		var cid int64
-		if err := rows.Scan(&t.ID, &t.Kind, &cid, &t.Domain, &t.Net, &t.Source, &t.Reason); err != nil {
+		if err := rows.Scan(&t.ID, &t.Kind, &cid, &t.CompanyName, &t.Domain, &t.Net, &t.Source, &t.Reason); err != nil {
 			return nil, err
 		}
 		t.TaskID = taskID