新增系统配置表及默认配置，更新链接生成请求DTO以支持链接数量参数，重构链接生成服务逻辑，添加链接状态查询和有效性检查接口，优化日志记录。

docs/game.sql

@@ -144,4 +144,33 @@ CREATE TABLE `user_account`  (
   CONSTRAINT `chk_points_nonneg` CHECK (`points_balance` >= 0)
 ) ENGINE = InnoDB AUTO_INCREMENT = 3 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = Dynamic;
 
+-- ----------------------------
+-- Table structure for system_config
+-- ----------------------------
+DROP TABLE IF EXISTS `system_config`;
+CREATE TABLE `system_config`  (
+  `id` bigint UNSIGNED NOT NULL AUTO_INCREMENT,
+  `config_key` varchar(100) NOT NULL COMMENT '配置键',
+  `config_value` text NOT NULL COMMENT '配置值',
+  `config_type` varchar(50) NOT NULL DEFAULT 'STRING' COMMENT '配置类型：STRING, INTEGER, BOOLEAN, JSON',
+  `description` varchar(500) NULL DEFAULT NULL COMMENT '配置描述',
+  `is_system` tinyint(1) NOT NULL DEFAULT 0 COMMENT '是否系统配置（1是，0否）',
+  `created_at` datetime(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+  `updated_at` datetime(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
+  PRIMARY KEY (`id`) USING BTREE,
+  UNIQUE INDEX `uk_config_key`(`config_key` ASC) USING BTREE,
+  INDEX `idx_config_type`(`config_type` ASC) USING BTREE
+) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = Dynamic;
+
+-- 插入默认配置
+INSERT INTO `system_config` (`config_key`, `config_value`, `config_type`, `description`, `is_system`) VALUES
+('link.default_quantity', '50', 'INTEGER', '链接生成默认奖励点数', 1),
+('link.refresh_interval', '300', 'INTEGER', '链接刷新间隔（秒）', 1),
+('link.qr_expire_time', '600', 'INTEGER', '二维码过期时间（秒）', 1),
+('link.max_times_per_batch', '100', 'INTEGER', '每批次最大刷奖励次数', 1),
+('link.min_quantity', '10', 'INTEGER', '最小奖励点数', 1),
+('link.max_quantity', '1000', 'INTEGER', '最大奖励点数', 1),
+('script.server_url', 'http://36.138.184.60:12345', 'STRING', '脚本服务器地址', 1),
+('script.qr_path_template', '/{machineId}/二维码.png', 'STRING', '二维码图片路径模板', 1);
+
 SET FOREIGN_KEY_CHECKS = 1;