feat: add reusable MySQL outbox and HTTP lifecycle example

examples/http-service/internal/jobs/schema.sql

@@ -0,0 +1,9 @@
+CREATE TABLE sender_jobs (
+ namespace_id CHAR(32) CHARACTER SET ascii COLLATE ascii_bin NOT NULL COMMENT '与Outbox相同的命名空间范围',
+ operation_id CHAR(32) CHARACTER SET ascii COLLATE ascii_bin NOT NULL COMMENT '本地业务操作标识，与Outbox同事务创建',
+ source_ref VARCHAR(512) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_bin NOT NULL COMMENT '待处理对象引用，首次入库后固定，不存对象正文或凭据',
+ task_id CHAR(32) CHARACTER SET ascii COLLATE ascii_bin NULL COMMENT '已确认的平台受理任务，为空不证明远端未受理',
+ created_at DATETIME(6) NOT NULL COMMENT '业务记录创建UTC时间，微秒精度',
+ updated_at DATETIME(6) NOT NULL COMMENT '关联任务最近变化UTC时间，微秒精度',
+ PRIMARY KEY (namespace_id,operation_id)
+) ENGINE=InnoDB COMMENT='接入方示例业务记录，与待发请求及受理关联分别同事务保存';