fix(backend-java): 收口并发资源与恢复链路

backend-java/src/main/java/com/nanri/aiimage/config/HttpClientPool.java

@@ -16,6 +16,20 @@ import java.time.Duration;
 public class HttpClientPool {
 
     private static volatile HttpClient sharedHttpClient;
+    private static volatile long configuredCallTimeoutMillis;
+
+    /** 由 Spring 配置属性在启动阶段调用，确保共享客户端使用实际的 connect/call 配置。 */
+    public static void configure(long connectTimeoutMillis, long callTimeoutMillis) {
+        configuredCallTimeoutMillis = Math.max(1_000L, callTimeoutMillis);
+        synchronized (HttpClientPool.class) {
+            if (sharedHttpClient == null) {
+                sharedHttpClient = HttpClient.newBuilder()
+                        .connectTimeout(Duration.ofMillis(Math.max(1_000L, connectTimeoutMillis)))
+                        .version(HttpClient.Version.HTTP_1_1)
+                        .build();
+            }
+        }
+    }
 
     /** 共享连接池实例：单一 HttpClient 承载全部外部调用的连接复用。 */
     public static HttpClient sharedHttpClient() {
@@ -26,7 +40,7 @@ public class HttpClientPool {
         synchronized (HttpClientPool.class) {
             if (sharedHttpClient == null) {
                 sharedHttpClient = HttpClient.newBuilder()
-                        .connectTimeout(Duration.ofSeconds(10))
+                        .connectTimeout(Duration.ofMillis(10_000L))
                         .version(HttpClient.Version.HTTP_1_1)
                         .build();
             }
@@ -36,7 +50,11 @@ public class HttpClientPool {
 
     /** 按 readTimeout（毫秒）创建共享连接池工厂；非法值钳制到最小正数。 */
     public static ClientHttpRequestFactory requestFactory(int readTimeoutMillis) {
-        int safeReadTimeout = Math.max(1, readTimeoutMillis);
+        long safeReadTimeout = Math.max(1L, readTimeoutMillis);
+        long callTimeout = configuredCallTimeoutMillis;
+        if (callTimeout > 0L) {
+            safeReadTimeout = Math.min(safeReadTimeout, callTimeout);
+        }
         JdkClientHttpRequestFactory factory =
                 new JdkClientHttpRequestFactory(sharedHttpClient());
         factory.setReadTimeout(Duration.ofMillis(safeReadTimeout));