feat(core): 新增苹果 App Store 订阅票据校验与向量存储结构升级

- 引入 Apple App Store Server Library，完成票据验证、续订、退款通知全套流程
- 新增 AppleReceiptController / AppleReceiptService 及相关配置类，支持沙箱与生产环境双端点
- 向量存储接口升级：EmbedSaveReq 封装向量与业务实体，QdrantVectorService 改为 JSON 字符串载荷并补全异常处理
- 补充 Apple 根证书与订阅密钥资源文件，pom 与 yml 增加对应依赖与配置

src/main/java/com/yolo/keyborad/MyApplication.java

@@ -1,14 +1,17 @@
 package com.yolo.keyborad;
 
+import com.yolo.keyborad.config.AppleAppStoreProperties;
 import lombok.extern.slf4j.Slf4j;
 import org.mybatis.spring.annotation.MapperScan;
 import org.slf4j.LoggerFactory;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
 
 @Slf4j
 @SpringBootApplication
 @MapperScan("com.yolo.keyborad.mapper")
+@EnableConfigurationProperties(AppleAppStoreProperties.class)
 public class MyApplication {
     public static void main(String[] args) {
         SpringApplication.run(MyApplication.class, args);