声明式编排层：接口即服务（AiService）。基于 JDK 动态代理把带 @SystemMessage/@UserMessage/@Tool/@Memory 注解的 Java 接口映射为可调用的 AI 服务，一行 FrameworkUtil.create 即得代理；复用 core 的 AiClient、JsonSchemaGenerator 与结构化输出能力，零第三方运行期依赖。
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