fix(agent): list_assets 按任务范围过滤，修复任务间资产互串 (#59)

list_assets 此前把任务 id 写死为 0、裸查整个共享资产库，模型又无从写出
范围过滤条件，于是把别的任务的资产（尤其 IP）当成本任务目标，测试方向
被带偏。

- 新增 QueryDSLInScope / GetByIDsInScope：只返回落在【本任务及直接关联
  任务】task_scope 内的资产，按归属匹配而非字面值（根域范围含其全部子域/
  服务/接口，网段范围含段内主机及服务）；越权 id 静默丢弃
- 新增 scopeTargetCTE（纯 scope 归属判定，不含 anchor/tested）；whereBuilder
  加占位符偏移，$1 留给 taskID
- 修复 IP 直连主机(http://1.2.3.4/api)无法被网段范围命中的盲区：谓词加
  OR ts.net >>= try_inet(a.domain)
- 非任务上下文(Auto/pentest, taskID<=0)无范围可依，回退全库
- QueryDSL/CountDSL 原样未动，UI 的「测试资产」视图（按生产者过滤）不受影响

db/task_assets_context.go

@@ -52,6 +52,42 @@ tested AS (
   JOIN context_tasks ctx ON ctx.exploration_id=en.exploration_id
 )`
 
+// scopeTargetCTE selects every asset that BELONGS to the current task's (and its
+// direct source tasks') declared scope — membership, not literal value: a
+// root_domain scope pulls in every subdomain / service / endpoint whose own
+// root_domain column equals it; an ip/cidr scope pulls in assets whose ip OR
+// IP-literal host falls inside the net. $1 is the task id. Unlike contextCoverageCTE
+// it carries neither the fact-anchor union nor the tested set — it is pure "in
+// declared scope", independent of what has already been touched. Used by the
+// agent's list_assets so a query returns the task's relevant assets, not the
+// whole shared库.
+const scopeTargetCTE = `
+context_tasks AS (
+  SELECT t.id AS task_id
+  FROM tasks t
+  WHERE t.id=$1 AND t.deleted_at IS NULL
+  UNION ALL
+  SELECT source.id
+  FROM task_relations relation
+  JOIN tasks source ON source.id=relation.source_task_id AND source.deleted_at IS NULL
+  WHERE relation.task_id=$1
+),
+target AS (
+  SELECT DISTINCT a.id
+  FROM assets a
+  JOIN task_scope ts ON (
+       (ts.kind='company'     AND a.company_id = ts.company_id)
+    OR (ts.kind='root_domain' AND a.root_domain = ts.domain)
+    OR (ts.kind='subdomain'   AND a.domain = ts.domain)
+    OR (ts.kind IN ('ip','cidr') AND (ts.net >>= try_inet(a.ip) OR ts.net >>= try_inet(a.domain)))
+    OR (ts.kind='icp' AND (
+         lower(regexp_replace(COALESCE(a.icp,''), '[[:space:]]+', '', 'g')) = ts.value
+         OR lower(regexp_replace(COALESCE(a.app_icp,''), '[[:space:]]+', '', 'g')) = ts.value
+       ))
+  )
+  JOIN context_tasks ctx ON ctx.task_id=ts.task_id
+)`
+
 // ListTaskScopeWithSources returns the current task's scope followed by the
 // scopes of its direct source tasks. TaskScope.TaskID preserves provenance.
 func (s *AssetStore) ListTaskScopeWithSources(taskID int64) ([]TaskScope, error) {