feat: 初始化考培练系统项目

- 从服务器拉取完整代码
- 按框架规范整理项目结构
- 配置 Drone CI 测试环境部署
- 包含后端(FastAPI)、前端(Vue3)、管理端

技术栈: Vue3 + TypeScript + FastAPI + MySQL

知识库/清空资料知识点.sql

@@ -0,0 +1,55 @@
+-- ========================================
+-- 清空指定资料的所有知识点（物理删除）
+-- 用途：为Dify工作流准备，清空旧知识点以便重新生成
+-- ========================================
+
+-- 使用方法：
+-- 1. 直接执行：将下面的 34 替换为实际的 material_id
+-- 2. 在Dify中使用：将整个SQL复制到Dify的SQL节点中
+
+-- ========================================
+-- 方式1：删除单个资料的知识点
+-- ========================================
+DELETE FROM knowledge_points WHERE material_id = 34;
+-- 验证删除结果
+SELECT '删除完成' as status, ROW_COUNT() as deleted_count;
+
+-- ========================================
+-- 方式2：使用变量（更灵活）
+-- ========================================
+-- SET @material_id = 34;
+-- DELETE FROM knowledge_points WHERE material_id = @material_id;
+-- SELECT CONCAT('已删除资料 ', @material_id, ' 的所有知识点') as result, ROW_COUNT() as count;
+
+-- ========================================
+-- 方式3：批量删除多个资料的知识点
+-- ========================================
+-- DELETE FROM knowledge_points WHERE material_id IN (34, 35, 36);
+-- SELECT ROW_COUNT() as total_deleted;
+
+-- ========================================
+-- 方式4：删除并验证（完整版）
+-- ========================================
+-- -- 查看删除前的数量
+-- SELECT '删除前' as timing, COUNT(*) as count FROM knowledge_points WHERE material_id = 34;
+-- 
+-- -- 执行删除
+-- DELETE FROM knowledge_points WHERE material_id = 34;
+-- 
+-- -- 查看删除后的数量（应该为0）
+-- SELECT '删除后' as timing, COUNT(*) as count FROM knowledge_points WHERE material_id = 34;
+
+-- ========================================
+-- 注意事项
+-- ========================================
+-- 1. 这是物理删除，数据无法恢复
+-- 2. 如果有错题记录引用这些知识点，会自动将 exam_mistakes.knowledge_point_id 设置为 NULL
+-- 3. 删除后可以通过Dify工作流重新生成新的知识点
+-- 4. 默认会自动提交事务（autocommit=1）
+
+-- ========================================
+-- 快速使用：Dify工作流SQL节点
+-- ========================================
+-- 复制以下单行命令到Dify的SQL执行节点：
+-- DELETE FROM knowledge_points WHERE material_id = {{material_id}};
+