fix: refresh custom placeholders without restart

Closes #5770

app/core/meta/customization.py

@@ -15,6 +15,17 @@ class CustomizationMatcher(metaclass=Singleton):
         self.customization = None
         self.custom_separator = None
 
+    @staticmethod
+    def _normalize_customization(customization):
+        """
+        规范化自定义占位符配置，兼容历史字符串与列表两种保存格式。
+        """
+        if isinstance(customization, str):
+            customization = customization.replace("\n", ";").replace("|", ";").strip(";").split(";")
+        if not customization:
+            return []
+        return list(filter(None, customization))
+
     def match(self, title=None):
         """
         :param title: 资源标题或文件名
@@ -22,14 +33,14 @@ class CustomizationMatcher(metaclass=Singleton):
         """
         if not title:
             return ""
-        if not self.customization:
-            # 自定义占位符
-            customization = self.systemconfig.get(SystemConfigKey.Customization)
-            if not customization:
-                return ""
-            if isinstance(customization, str):
-                customization = customization.replace("\n", ";").replace("|", ";").strip(";").split(";")
-            self.customization = "|".join([f"({item})" for item in customization])
+        # 自定义占位符需要跟随系统配置实时生效，避免单例缓存导致保存后仍沿用旧规则。
+        customization = self._normalize_customization(
+            self.systemconfig.get(SystemConfigKey.Customization)
+        )
+        if not customization:
+            self.customization = None
+            return ""
+        self.customization = "|".join([f"({item})" for item in customization])
 
         customization_re = re.compile(r"%s" % self.customization)
         # 处理重复多次的情况，保留先后顺序（按添加自定义占位符的顺序）