fix(weixin): support classify_list parsing and log classify payload

Log classify response snippets for debugging and parse the official data.classify_list/sub_classify tree to build cats_v2 when categories is absent.

Made-with: Cursor

service/src/main/java/cn/qihangerp/service/external/sph/ExternalSphPublishService.java

@@ -293,6 +293,8 @@ public class ExternalSphPublishService {
                     + "access_token=" + URLEncoder.encode(accessToken.trim(), StandardCharsets.UTF_8);
             String raw = httpClient.postJson(fullUrl, body.toJSONString(),
                     Duration.ofSeconds(Math.max(5, props.getHttpReadTimeoutSeconds())));
+            log.info("[SPH] classify response shopId={} outGoodsId={} snippet={}",
+                    req.getShopId(), req.getOutGoodsId(), WeixinShopEcLogSupport.snippet(raw, 2000));
             if (!WeixinShopEcHttpClient.isBizOk(raw)) {
                 throw new IllegalStateException("类目推荐失败: " + WeixinShopEcHttpClient.formatWxError(raw));
             }
@@ -313,6 +315,14 @@ public class ExternalSphPublishService {
 
     private static JSONArray parseRecommendedCatsV2(String raw) {
         JSONObject root = JSON.parseObject(raw);
+        JSONObject data = root.getJSONObject("data");
+        if (data != null) {
+            JSONArray classifyList = data.getJSONArray("classify_list");
+            JSONArray fromClassify = parseFromClassifyTree(classifyList);
+            if (fromClassify != null && !fromClassify.isEmpty()) {
+                return fromClassify;
+            }
+        }
         JSONArray categories = root.getJSONArray("categories");
         if (categories == null || categories.isEmpty()) {
             return null;
@@ -356,6 +366,56 @@ public class ExternalSphPublishService {
         return null;
     }
 
+    private static JSONArray parseFromClassifyTree(JSONArray classifyList) {
+        if (classifyList == null || classifyList.isEmpty()) {
+            return null;
+        }
+        JSONObject node = pickBestClassifyNode(classifyList);
+        if (node == null) {
+            return null;
+        }
+        JSONArray out = new JSONArray();
+        while (node != null) {
+            Long catIdNum = node.getLong("cat_id");
+            String catId = catIdNum == null ? node.getString("cat_id") : String.valueOf(catIdNum);
+            if (StringUtils.hasText(catId)) {
+                JSONObject one = new JSONObject();
+                one.put("cat_id", catId.trim());
+                out.add(one);
+            }
+            JSONArray sub = node.getJSONArray("sub_classify");
+            if (sub == null || sub.isEmpty()) {
+                break;
+            }
+            node = pickBestClassifyNode(sub);
+        }
+        return out.isEmpty() ? null : out;
+    }
+
+    private static JSONObject pickBestClassifyNode(JSONArray arr) {
+        JSONObject bestQualified = null;
+        double bestQualifiedScore = -1D;
+        JSONObject bestAny = null;
+        double bestAnyScore = -1D;
+        for (Object o : arr) {
+            if (!(o instanceof JSONObject n)) {
+                continue;
+            }
+            double score = n.getDoubleValue("confidence");
+            if (bestAny == null || score > bestAnyScore) {
+                bestAny = n;
+                bestAnyScore = score;
+            }
+            if (n.getBooleanValue("qualification")) {
+                if (bestQualified == null || score > bestQualifiedScore) {
+                    bestQualified = n;
+                    bestQualifiedScore = score;
+                }
+            }
+        }
+        return bestQualified != null ? bestQualified : bestAny;
+    }
+
     private static boolean hasCategoryAuth(JSONObject o) {
         if (o == null) {
             return false;