feat(knowledge): 工单验收自动生成草稿，核对后发布，来源可追

- knowledge_doc 与 item 1:1，除 source_kind=manual 外必须有来源（库级约束）
- 状态机 draft/in_review/published/archived，发布要 owner/admin；非法动作回 allowed_from 与 allowed_actions
- 工单验收通过自动落 postmortem 草稿（generated_by=rule），同一来源只生成一次
- 接口：列表/详情/手记/改内容/状态动作/从事项沉淀；已发布禁改，改内容带乐观锁
- Web 知识页 + 详情抽屉；任务与工单详情里可「沉淀成知识」
- 8 个后端用例 + e2e 7 项断言（沉淀 → 待核对 → 发布）

web/src/lib/types.ts

@@ -112,3 +112,31 @@ export interface Notification {
   read_at: string | null;
   created_at: string;
 }
+
+export type KnowledgeStatus = "draft" | "in_review" | "published" | "archived";
+
+export interface KnowledgeInfo {
+  doc_type: string;
+  summary: string;
+  status_hint: KnowledgeStatus;
+  source_kind: "manual" | "task" | "ticket";
+  source_item_id: string | null;
+  generated_by: "human" | "rule";
+  published_at: string | null;
+  archived_at: string | null;
+  chunk_count: number;
+  author_id: string;
+}
+
+export interface KnowledgeSource {
+  id: string;
+  kind: string;
+  title: string;
+  status: string;
+}
+
+export interface Knowledge extends Item {
+  knowledge: KnowledgeInfo;
+  source: KnowledgeSource | null;
+  activities?: Activity[];
+}