feat():learning后台管理项目初始化

migrations/20250129_add_client_id_to_invite_codes.sql

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+-- 为 admin_invite_codes 表添加 client_id 字段
+-- 日期: 2025-01-29
+-- 说明: 添加客户端ID字段，用于区分不同客户端（观察版/用户版）
+
+-- 添加 client_id 列
+ALTER TABLE `admin_invite_codes`
+ADD COLUMN `client_id` varchar(64) DEFAULT NULL COMMENT '客户端ID' AFTER `is_used`;
+
+-- 更新现有记录的 client_id 为默认值（用户版）
+-- 如果需要保持为 NULL，可以注释掉下面这行
+UPDATE `admin_invite_codes` SET `client_id` = 'J10f8yxU1XDl1Tn00MXKeA' WHERE `client_id` IS NULL;

migrations/20250131_add_invite_code_applications_table.sql

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+-- 创建邀请码申请表
+CREATE TABLE IF NOT EXISTS `admin_invite_code_applications` (
+    `id` INT UNSIGNED NOT NULL AUTO_INCREMENT COMMENT '主键ID',
+    `email` VARCHAR(255) NOT NULL COMMENT '申请邮箱',
+    `reason` TEXT COMMENT '申请理由',
+    `status` VARCHAR(20) NOT NULL DEFAULT 'pending' COMMENT '申请状态:pending-待处理,approved-已通过,rejected-已拒绝',
+    `invite_code_id` INT UNSIGNED COMMENT '关联的邀请码ID',
+    `reject_reason` TEXT COMMENT '拒绝理由',
+    `approved_at` DATETIME COMMENT '审批时间',
+    `approved_by` VARCHAR(64) COMMENT '审批人',
+    `email_sent_at` DATETIME COMMENT '邮件发送时间',
+    `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
+    `updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
+    `deleted_at` DATETIME COMMENT '软删除时间',
+    PRIMARY KEY (`id`),
+    INDEX `idx_email` (`email`),
+    INDEX `idx_status` (`status`),
+    INDEX `idx_deleted_at` (`deleted_at`),
+    CONSTRAINT `fk_invite_code_id` FOREIGN KEY (`invite_code_id`) REFERENCES `admin_invite_codes`(`id`) ON DELETE SET NULL
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='邀请码申请表';

migrations/20250204_add_language_to_invite_code_applications.sql

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+-- 添加 language 字段到 admin_invite_code_applications 表
+ALTER TABLE admin_invite_code_applications
+ADD COLUMN language VARCHAR(10) DEFAULT 'zh' COMMENT '语言:zh-中文,en-英文' AFTER reason;