fix(iap/apple): 修复PEM格式私钥并添加调试回退逻辑

修复从请求中获取的PEM格式私钥缺少换行符的问题，自动添加正确格式
添加开发环境下的硬编码私钥回退逻辑，便于调试

initialize/migrate/database/02121_apple_iap_transactions.down.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS `apple_iap_transactions`;

initialize/migrate/database/02121_apple_iap_transactions.up.sql

@@ -0,0 +1,15 @@
+CREATE TABLE IF NOT EXISTS `apple_iap_transactions` (
+    `id` bigint(20) NOT NULL AUTO_INCREMENT,
+    `user_id` bigint(20) NOT NULL COMMENT 'User ID',
+    `original_transaction_id` varchar(255) NOT NULL COMMENT 'Original Transaction ID',
+    `transaction_id` varchar(255) NOT NULL COMMENT 'Transaction ID',
+    `product_id` varchar(255) NOT NULL COMMENT 'Product ID',
+    `purchase_at` datetime NOT NULL COMMENT 'Purchase Time',
+    `revocation_at` datetime DEFAULT NULL COMMENT 'Revocation Time',
+    `jws_hash` varchar(255) NOT NULL COMMENT 'JWS Hash',
+    `created_at` datetime DEFAULT NULL COMMENT 'Create Time',
+    `updated_at` datetime DEFAULT NULL COMMENT 'Update Time',
+    PRIMARY KEY (`id`),
+    UNIQUE KEY `uni_original` (`original_transaction_id`),
+    KEY `idx_user_id` (`user_id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;