task-168: LLM 客户端配置接入（LlmHttpConfigResolver 从 aiimage.http-client.* 读取超时/重试，默认值同现状、钳制、可覆盖）+ 8 条测试

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

@@ -0,0 +1,38 @@
+package com.nanri.aiimage.config;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Component;
+
+/**
+ * LLM 客户端统一配置解析（task-168，Coze 已改直连 LLM）。
+ *
+ * 从 aiimage.http-client.* 命名空间读取 LLM 客户端超时/重试，默认值与现状一致
+ * （connect 10s / read 60s / call 90s / retry 3）；非法值钳制。模块级显式配置
+ * （SimilarAsinProperties.llm*）优先级高于命名空间（行为不变）。
+ */
+@Component
+@RequiredArgsConstructor
+public class LlmHttpConfigResolver {
+
+    private final HttpClientProperties httpClientProperties;
+
+    public long connectTimeoutMillis() {
+        return httpClientProperties.effectiveConnectTimeoutMillis();
+    }
+
+    public long readTimeoutMillis() {
+        return httpClientProperties.effectiveReadTimeoutMillis();
+    }
+
+    public long callTimeoutMillis() {
+        return httpClientProperties.effectiveCallTimeoutMillis();
+    }
+
+    public int maxRetries() {
+        return httpClientProperties.effectiveMaxRetries();
+    }
+
+    public long baseRetryDelayMillis() {
+        return httpClientProperties.getBaseRetryDelayMillis();
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/config/LlmHttpConfigResolverTest.java

@@ -0,0 +1,86 @@
+package com.nanri.aiimage.config;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * task-168：LLM 客户端配置接入契约（plan 10）。
+ * 从 aiimage.http-client.* 读取超时/重试；默认值与现状一致；覆盖生效；
+ * 非法值钳制。
+ */
+class LlmHttpConfigResolverTest {
+
+    private HttpClientProperties properties;
+    private LlmHttpConfigResolver resolver;
+
+    @BeforeEach
+    void setUp() {
+        properties = new HttpClientProperties();
+        resolver = new LlmHttpConfigResolver(properties);
+    }
+
+    @Test
+    void timeoutFromConfigApplied() {
+        assertEquals(10_000L, resolver.connectTimeoutMillis());
+        assertEquals(60_000L, resolver.readTimeoutMillis());
+        assertEquals(90_000L, resolver.callTimeoutMillis());
+    }
+
+    @Test
+    void defaultValuesKept() {
+        // 命名空间默认 = 现状基线（connect 10s / read 60s / call 90s / retry 3）
+        assertEquals(10_000L, resolver.connectTimeoutMillis());
+        assertEquals(60_000L, resolver.readTimeoutMillis());
+        assertEquals(3, resolver.maxRetries());
+        assertEquals(500L, resolver.baseRetryDelayMillis());
+    }
+
+    @Test
+    void overrideTakesEffect() {
+        properties.setConnectTimeoutMillis(30_000);
+        properties.setReadTimeoutMillis(120_000);
+        properties.setMaxRetries(5);
+
+        assertEquals(30_000L, resolver.connectTimeoutMillis());
+        assertEquals(120_000L, resolver.readTimeoutMillis());
+        assertEquals(5, resolver.maxRetries());
+    }
+
+    @Test
+    void callTimeoutReflectsTotal() {
+        properties.setCallTimeoutMillis(180_000);
+        assertEquals(180_000L, resolver.callTimeoutMillis());
+    }
+
+    @Test
+    void retryConfigReflected() {
+        properties.setMaxRetries(0);
+        assertEquals(0, resolver.maxRetries());
+        properties.setMaxRetries(99);
+        assertEquals(10, resolver.maxRetries(), "重试钳制到 10");
+    }
+
+    @Test
+    void invalidTimeoutsClamped() {
+        properties.setConnectTimeoutMillis(-1);
+        assertEquals(1_000L, resolver.connectTimeoutMillis());
+        properties.setReadTimeoutMillis(999_999_999L);
+        assertEquals(3_600_000L, resolver.readTimeoutMillis());
+    }
+
+    @Test
+    void resolverBindingWired() {
+        assertTrue(resolver.connectTimeoutMillis() > 0);
+        assertTrue(resolver.maxRetries() >= 0);
+    }
+
+    @Test
+    void behaviorSameAsCurrentBaseline() {
+        // 与 SimilarAsinProperties.llm 现状对比：connect 一致（10s）、重试一致（3）
+        assertEquals(10_000L, resolver.connectTimeoutMillis());
+        assertEquals(3, resolver.maxRetries());
+    }
+}