feat：followup 累积用户澄清回答到全局缓存

server/src/main/java/com/emotion/service/impl/ShortNovelServiceImpl.java

@@ -201,6 +201,23 @@ public class ShortNovelServiceImpl implements ShortNovelService {
             }
         }
 
+        // 累积用户澄清回答到 session 缓存（用于详情页还原完整澄清流程）
+        if ("answer_clarification".equals(request.getAction())
+                && request.getSessionId() != null && !request.getSessionId().isEmpty()) {
+            Object answer = request.getPayload() != null ? request.getPayload().get("answer") : null;
+            if (answer == null && request.getPayload() != null) {
+                // 兼容前端可能用 value 字段传答案
+                answer = request.getPayload().get("value");
+            }
+            if (answer != null) {
+                JSONObject entry = new JSONObject();
+                entry.put("kind", "clarification_answer");
+                entry.put("answer", String.valueOf(answer));
+                accumulateStage(request.getSessionId(), entry);
+                log.debug("[ShortNovel] 累积澄清回答: sessionId={}", request.getSessionId());
+            }
+        }
+
         Map<String, Object> upstreamBody = new HashMap<>();
         upstreamBody.put("session_id", request.getSessionId());
         upstreamBody.put("user_id", currentUserId);