feat(knowledge): 会话级去重 + 知识域地图注入 Planner 解决 ISS-001 重复检索

- RetrievedDocTracker: sessionId → Set<filePath> 会话级去重，LookupKnowledgeTool Step 5 过滤已检索文档
- KnowledgeDomainService: 域级聚合，LLM 生成 when_to_retrieve，构建 knowledge map YAML
- DocumentFieldEnricher: 上传时 LLM 补全 covers + whenToRetrieve（含同域文档排除上下文）
- KnowledgeDomain entity + V009 迁移: 域级元数据持久化，避免重启重复 LLM 调用
- ChatService: 注入 knowledge map 到 Planner prompt，会话结束时清理去重状态
- KnowledgeIndexService: 手写 JSON 解析替换为 Jackson ObjectMapper，启动时补建缺失域记录
- chat-planner-prompt: 新增知识库检索规则（按域 when_to_retrieve 判断，每域最多一次检索）
- doc-field-enricher-prompt / domain-summary-prompt: 外部化 LLM 提示词

src/main/java/com/superbiz/agent/service/DocumentManagementService.java

@@ -58,6 +58,12 @@ public class DocumentManagementService {
     @Autowired
     private KnowledgeIndexService knowledgeIndexService;
 
+    @Autowired
+    private DocumentFieldEnricher documentFieldEnricher;
+
+    @Autowired
+    private KnowledgeDomainService knowledgeDomainService;
+
     @Autowired
     private ObjectMapper objectMapper;
 
@@ -123,6 +129,8 @@ public class DocumentManagementService {
             if (frontmatterParser.hasFrontmatter(text)) {
                 frontmatter = frontmatterParser.parse(text);
                 if (frontmatter != null) {
+                    // LLM 补全 covers / whenToRetrieve（已有值则跳过）
+                    documentFieldEnricher.enrich(frontmatter, text, category);
                     log.info("解析到frontmatter: title={}, keywords={}, time={}ms",
                         frontmatter.getTitle(), frontmatter.getKeywords(), System.currentTimeMillis() - frontmatterStart);
                 } else {
@@ -196,12 +204,17 @@ public class DocumentManagementService {
                     .summary(frontmatter.getSummary())
                     .category(category)
                     .sections(frontmatter.getSections())
+                    .covers(frontmatter.getCovers())
+                    .whenToRetrieve(frontmatter.getWhenToRetrieve())
                     .build();
 
                 knowledgeIndexService.addToIndex(entry);
                 log.info("文档已加入L0索引: docId={}, title={}", docId, frontmatter.getTitle());
             }
 
+            // 触发域级聚合重算
+            knowledgeDomainService.onDocumentChange(category);
+
             long totalTime = System.currentTimeMillis() - startTime;
             log.info("文档上传完成: docId={}, fileName={}, hasFrontmatter={}, totalTime={}ms",
                 docId, fileName, frontmatter != null, totalTime);
@@ -367,6 +380,31 @@ public class DocumentManagementService {
         // 删除元数据
         apiDocumentRepository.delete(doc);
         log.info("文档已删除，docId: {}", docId);
+
+        // 触发域级聚合重算
+        String category = doc.getFilePath() != null
+                ? resolveCategory(doc.getFilePath()) : null;
+        if (category != null) {
+            knowledgeDomainService.onDocumentChange(category);
+        }
+    }
+
+    /**
+     * 转换为响应 DTO
+     */
+    /**
+     * 从 filePath 解析 category（取 knowledge_base/{category}/... 中的 category 段）
+     */
+    private String resolveCategory(String filePath) {
+        try {
+            java.nio.file.Path p = java.nio.file.Paths.get(filePath);
+            // filePath 形如 knowledge_base/payment/xxx.md，取倒数第二段
+            int nameCount = p.getNameCount();
+            if (nameCount >= 2) {
+                return p.getName(nameCount - 2).toString();
+            }
+        } catch (Exception ignored) {}
+        return null;
     }
 
     /**