feat: 接口管理功能 - 分页查询、详情查看、测试代理

- 后端：OpenAPI spec 解析同步、接口分页查询、代理测试（SSRF防护）
- 前端：接口列表页、详情对话框（详情/测试双标签）、Token来源选择
- 服务启动自动同步接口数据，支持手动触发同步
- 测试代理路径修复：自动添加 /api 前缀以匹配后端 SSRF 校验

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend-single/src/main/java/com/emotion/dto/response/ApiEndpointItemResponse.java

@@ -11,6 +11,7 @@ public class ApiEndpointItemResponse {
     private String id;
     private String path;
     private String method;
+    private String operationId;
     private String summary;
     private String tags;
     private Integer deprecated;

backend-single/src/main/java/com/emotion/service/impl/ApiEndpointServiceImpl.java

@@ -130,6 +130,7 @@ public class ApiEndpointServiceImpl implements ApiEndpointService {
             JsonNode paths = root.path("paths");
             Iterator<Map.Entry<String, JsonNode>> pathEntries = paths.fields();
             int count = 0;
+            java.util.Set<String> seenOperationIds = new java.util.HashSet<>();
 
             while (pathEntries.hasNext()) {
                 Map.Entry<String, JsonNode> pathEntry = pathEntries.next();
@@ -146,6 +147,11 @@ public class ApiEndpointServiceImpl implements ApiEndpointService {
 
                     String operationId = endpointNode.path("operationId").asText();
                     if (operationId.isEmpty()) continue;
+                    if (seenOperationIds.contains(operationId)) {
+                        log.warn("跳过重复 operationId: {} ({} {})", operationId, path, method);
+                        continue;
+                    }
+                    seenOperationIds.add(operationId);
 
                     ApiEndpoint apiEndpoint = ApiEndpoint.builder()
                             .path(path)
@@ -294,6 +300,7 @@ public class ApiEndpointServiceImpl implements ApiEndpointService {
         r.setId(e.getId());
         r.setPath(e.getPath());
         r.setMethod(e.getMethod());
+        r.setOperationId(e.getOperationId());
         r.setSummary(e.getSummary());
         r.setTags(e.getTags());
         r.setDeprecated(e.getDeprecated());