fix(client): 修复动态图片域名从未生效（对不可变列表 add() 抛异常）

jmcomic-core/src/main/java/io/github/jukomu/jmcomic/core/client/AbstractJmClient.java

@@ -103,13 +103,18 @@ protected AbstractJmClient(JmConfiguration config, OkHttpClient httpClient, Cook
         /*
          * 后台异步初始化：更新域名列表 -> 域名探活排掉死域名 -> 启动定期复探 -> 调子类初始化
          */
-        this.internalExecutor.submit(() -> {
-            this.updateDomains();
-            DomainProbe probe = createDomainProbe();
-            this.domainManager.probeAllDomains(probe);
-            this.domainManager.startPeriodicProbe(probe, config.getDomainProbeIntervalMs());
-            this.domainManager.setInitialized(true);
-            this.initialize();
+        this.internalExecutor.execute(() -> {
+            try {
+                this.updateDomains();
+                DomainProbe probe = createDomainProbe();
+                this.domainManager.probeAllDomains(probe);
+                this.domainManager.startPeriodicProbe(probe, config.getDomainProbeIntervalMs());
+                this.domainManager.setInitialized(true);
+                this.initialize();
+            } catch (RuntimeException e) {
+                logger.error("后台初始化任务执行失败", e);
+                throw e;
+            }
         });
         // 生成一个 128位的 AES 随机密钥
         try {

jmcomic-core/src/main/java/io/github/jukomu/jmcomic/core/client/impl/JmApiClient.java

@@ -25,6 +25,7 @@
 import java.io.IOException;
 import java.net.CookieManager;
 import java.net.MalformedURLException;
+import java.net.URI;
 import java.net.URL;
 import java.time.Instant;
 import java.util.List;
@@ -111,8 +112,38 @@ private void updateSetting() {
             logger.info("当前API客户端版本[{}]，更新API客户端版本[{}] -> [{}]", JmConstants.APP_VERSION, JmConstants.APP_VERSION, JmConstants.APP_VERSION);
         }
 
-        if (imgHost != null) {
-            JmConstants.DEFAULT_IMAGE_DOMAINS.add(imgHost);
+        String imageHost = normalizeImageHost(imgHost);
+        if (imageHost != null) {
+            boolean added;
+            synchronized (JmConstants.DEFAULT_IMAGE_DOMAINS) {
+                added = !JmConstants.DEFAULT_IMAGE_DOMAINS.contains(imageHost) && JmConstants.DEFAULT_IMAGE_DOMAINS.add(imageHost);
+            }
+            if (added) {
+                logger.info("添加动态图片域名[{}]，当前图片域名列表: {}", imageHost, JmConstants.DEFAULT_IMAGE_DOMAINS);
+            }
+        }
+    }
+
+    /**
+     * 标准化图片域名，提取并返回主机名（Host）。
+     *
+     * @param imgHost 图片URL或主机名，可为任意格式
+     * @return 标准化后的主机名
+     */
+    private static String normalizeImageHost(String imgHost) {
+        if (StringUtils.isBlank(imgHost)) {
+            return null;
+        }
+
+        String value = imgHost.trim();
+        try {
+            URI uri = URI.create(value);
+            if (uri.getScheme() == null) {
+                uri = URI.create(JmConstants.PROTOCOL_HTTPS + value);
+            }
+            return uri.getHost();
+        } catch (IllegalArgumentException e) {
+            return null;
         }
     }
 

jmcomic-core/src/main/java/io/github/jukomu/jmcomic/core/constant/JmConstants.java

@@ -4,6 +4,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.concurrent.CopyOnWriteArrayList;
 
 /**
  * @author JUKOMU
@@ -126,7 +127,7 @@ private JmConstants() {
             "www.cdnplaystation6.cc"
     ));
 
-    public static List<String> DEFAULT_IMAGE_DOMAINS = Collections.unmodifiableList(List.of(
+    public static List<String> DEFAULT_IMAGE_DOMAINS = new CopyOnWriteArrayList<>(List.of(
             "cdn-msp.jmapiproxy1.cc",
             "cdn-msp.jmapiproxy2.cc",
             "cdn-msp2.jmapiproxy2.cc",