task-78: 为所有外部调用增加耗时、重试、失败率和 payload 字节指标

新增 ExternalCallMetricsRecorder：通过 RestClient 拦截器统一记录
aiimage.external-call.duration（耗时）、aiimage.external-call.total
（失败率）、aiimage.external-call.payload.bytes（请求字节）与
aiimage.external-call.retry.total（重试次数）；Coze/品牌检查/紫鸟
三个外部客户端全部接入，指标注册表缺失时静默降级，不改变调用语义。

backend-java/src/test/java/com/nanri/aiimage/modules/appearancepatent/client/AppearancePatentCozeClientTest.java

@@ -22,7 +22,7 @@ class AppearancePatentCozeClientTest {
             new AppearancePatentProperties(),
             new ObjectMapper(),
             null,
-            new BrandCheckClient(new BrandCheckProperties())
+            new BrandCheckClient(new BrandCheckProperties(), null)
     );
 
     @Test

backend-java/src/test/java/com/nanri/aiimage/modules/brand/client/BrandCheckClientTest.java

@@ -11,7 +11,7 @@ class BrandCheckClientTest {
 
     @Test
     void splitTitleTextSupportsCommonSeparatorsAndQuotes() {
-        BrandCheckClient client = new BrandCheckClient(new BrandCheckProperties());
+        BrandCheckClient client = new BrandCheckClient(new BrandCheckProperties(), null);
 
         List<String> brands = client.splitTitleText("'阿凡达,任天堂'； Disney、LEGO\nSony");
 
@@ -20,7 +20,7 @@ class BrandCheckClientTest {
 
     @Test
     void splitTitleTextDeduplicatesBlankValues() {
-        BrandCheckClient client = new BrandCheckClient(new BrandCheckProperties());
+        BrandCheckClient client = new BrandCheckClient(new BrandCheckProperties(), null);
 
         List<String> brands = client.splitTitleText(" 任天堂, ,任天堂，Sony ");
 

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/client/SimilarAsinCozeClientLoggingTest.java

@@ -127,7 +127,7 @@ class SimilarAsinCozeClientLoggingTest {
         row.setTitle("T".repeat(5000));
         row.setSku("SKU-SECRET");
         rows.add(row);
-        SimilarAsinCozeClient client = new SimilarAsinCozeClient(new SimilarAsinProperties(), objectMapper, null);
+        SimilarAsinCozeClient client = new SimilarAsinCozeClient(new SimilarAsinProperties(), objectMapper, null, null);
         Method maskMethod = SimilarAsinCozeClient.class.getDeclaredMethod(
                 "maskCozeRequestBody", Map.class);
         maskMethod.setAccessible(true);

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/client/SimilarAsinCozeClientTest.java

@@ -38,7 +38,7 @@ class SimilarAsinCozeClientTest {
                 ]
                 """, new TypeReference<>() {
         });
-        SimilarAsinCozeClient client = new SimilarAsinCozeClient(new SimilarAsinProperties(), objectMapper, null);
+        SimilarAsinCozeClient client = new SimilarAsinCozeClient(new SimilarAsinProperties(), objectMapper, null, null);
 
         Method method = SimilarAsinCozeClient.class.getDeclaredMethod(
                 "buildParameters", List.class, String.class, String.class, boolean.class);
@@ -71,7 +71,7 @@ class SimilarAsinCozeClientTest {
         row.setPrice("8.50");
         row.setTitle("Legacy title");
         row.setSku("SKU-LEGACY");
-        SimilarAsinCozeClient client = new SimilarAsinCozeClient(new SimilarAsinProperties(), objectMapper, null);
+        SimilarAsinCozeClient client = new SimilarAsinCozeClient(new SimilarAsinProperties(), objectMapper, null, null);
 
         Method method = SimilarAsinCozeClient.class.getDeclaredMethod(
                 "buildParameters", List.class, String.class, String.class, boolean.class);
@@ -102,7 +102,7 @@ class SimilarAsinCozeClientTest {
                 ]
                 """, new TypeReference<>() {
         });
-        SimilarAsinCozeClient client = new SimilarAsinCozeClient(new SimilarAsinProperties(), objectMapper, null);
+        SimilarAsinCozeClient client = new SimilarAsinCozeClient(new SimilarAsinProperties(), objectMapper, null, null);
 
         Method method = SimilarAsinCozeClient.class.getDeclaredMethod(
                 "buildParameters", List.class, String.class, String.class, boolean.class);
@@ -128,7 +128,7 @@ class SimilarAsinCozeClientTest {
         row.setUrl("https://m.media-amazon.com/images/I/main.jpg");
         row.setUrls(List.of("https://cbu01.alicdn.com/img/ibank/fallback.jpg"));
         row.setPrice("");
-        SimilarAsinCozeClient client = new SimilarAsinCozeClient(new SimilarAsinProperties(), objectMapper, null);
+        SimilarAsinCozeClient client = new SimilarAsinCozeClient(new SimilarAsinProperties(), objectMapper, null, null);
 
         Method method = SimilarAsinCozeClient.class.getDeclaredMethod(
                 "buildParameters", List.class, String.class, String.class, boolean.class);
@@ -162,7 +162,7 @@ class SimilarAsinCozeClientTest {
                 ]
                 """, new TypeReference<>() {
         });
-        SimilarAsinCozeClient client = new SimilarAsinCozeClient(new SimilarAsinProperties(), objectMapper, null);
+        SimilarAsinCozeClient client = new SimilarAsinCozeClient(new SimilarAsinProperties(), objectMapper, null, null);
 
         Method method = SimilarAsinCozeClient.class.getDeclaredMethod(
                 "buildParameters", List.class, String.class, String.class, boolean.class);
@@ -188,7 +188,7 @@ class SimilarAsinCozeClientTest {
         SimilarAsinResultRowDto row = new SimilarAsinResultRowDto();
         row.setAsin("B0CATEGORY1");
         row.setTitle("Category test");
-        SimilarAsinCozeClient client = new SimilarAsinCozeClient(new SimilarAsinProperties(), objectMapper, null);
+        SimilarAsinCozeClient client = new SimilarAsinCozeClient(new SimilarAsinProperties(), objectMapper, null, null);
 
         Method method = SimilarAsinCozeClient.class.getDeclaredMethod(
                 "buildParameters", List.class, String.class, String.class, boolean.class, boolean.class);
@@ -201,7 +201,7 @@ class SimilarAsinCozeClientTest {
 
     @Test
     void imageOnlyWorkflowOutputIsExtractedAndMergedByAsin() throws Exception {
-        SimilarAsinCozeClient client = new SimilarAsinCozeClient(new SimilarAsinProperties(), objectMapper, null);
+        SimilarAsinCozeClient client = new SimilarAsinCozeClient(new SimilarAsinProperties(), objectMapper, null, null);
         String imageData = """
                 {"data":[{
                   "asin":"B0BQNHDP2F",