feat: 添加用户管理模块 + username/email 唯一约束

- 新增 UserController，实现完整的用户 CRUD 接口
- 扩展 SysUserService 接口和实现类
- 为 sys_user 表添加 username 和 email 唯一约束
- 添加 phone、role_type、status 索引优化查询性能
- 修复 Result 类方法名（failed -> error）

相关接口：
- GET /api/users - 获取用户列表（分页）
- GET /api/users/:id - 获取用户详情
- POST /api/users - 创建用户
- PUT /api/users/:id - 更新用户
- DELETE /api/users/:id - 删除用户
- GET /api/users/teachers - 获取教师列表
- POST /api/users/change-password - 修改密码
- PUT /api/users/profile - 更新个人资料

backend/target/classes/data.sql

@@ -1,38 +1,38 @@
 -- 预埋测试数据
 
 -- 1. 管理员账号 (密码: admin123)
-INSERT INTO sys_user (username, password, real_name, gender, role_type, status) VALUES
+INSERT IGNORE INTO sys_user (username, password, real_name, gender, role_type, status) VALUES
 ('admin', '$2a$10$N.zmdr9k7uOCQb376NoUnuTJ8iAt6Z5EHsM8lE9lBOsl7iAt9hQIu', '系统管理员', 1, 3, 1);
 
 -- 2. 教师账号 (密码: teacher123)
-INSERT INTO sys_user (username, password, real_name, gender, role_type, status) VALUES
+INSERT IGNORE INTO sys_user (username, password, real_name, gender, role_type, status) VALUES
 ('teacher001', '$2a$10$N.zmdr9k7uOCQb376NoUnuTJ8iAt6Z5EHsM8lE9lBOsl7iAt9hQIu', '张教授', 1, 2, 1),
 ('teacher002', '$2a$10$N.zmdr9k7uOCQb376NoUnuTJ8iAt6Z5EHsM8lE9lBOsl7iAt9hQIu', '李老师', 2, 2, 1);
 
 -- 3. 学生账号 (密码: student123)
-INSERT INTO sys_user (username, password, real_name, gender, role_type, status) VALUES
+INSERT IGNORE INTO sys_user (username, password, real_name, gender, role_type, status) VALUES
 ('student001', '$2a$10$N.zmdr9k7uOCQb376NoUnuTJ8iAt6Z5EHsM8lE9lBOsl7iAt9hQIu', '王小明', 1, 1, 1),
 ('student002', '$2a$10$N.zmdr9k7uOCQb376NoUnuTJ8iAt6Z5EHsM8lE9lBOsl7iAt9hQIu', '李小红', 2, 1, 1),
 ('student003', '$2a$10$N.zmdr9k7uOCQb376NoUnuTJ8iAt6Z5EHsM8lE9lBOsl7iAt9hQIu', '张小华', 1, 1, 1);
 
 -- 4. 教师信息
-INSERT INTO teacher_info (user_id, teacher_no, college, title, research_field) VALUES
+INSERT IGNORE INTO teacher_info (user_id, teacher_no, college, title, research_field) VALUES
 (2, 'T2024001', '计算机学院', '教授', '人工智能'),
 (3, 'T2024002', '计算机学院', '副教授', '大数据');
 
 -- 5. 学生信息
-INSERT INTO stu_info (user_id, student_no, college, major, grade, class_name, advisor_id) VALUES
+INSERT IGNORE INTO stu_info (user_id, student_no, college, major, grade, class_name, advisor_id) VALUES
 (4, 'S2021001', '计算机学院', '计算机科学与技术', '2021', '计科2101', 2),
 (5, 'S2021002', '计算机学院', '软件工程', '2021', '软工2101', 2),
 (6, 'S2022001', '计算机学院', '计算机科学与技术', '2022', '计科2201', 3);
 
 -- 6. 测试项目
-INSERT INTO project (project_no, project_name, project_type, project_level, leader_id, advisor_id, description, status) VALUES
+INSERT IGNORE INTO project (project_no, project_name, project_type, project_level, leader_id, advisor_id, description, status) VALUES
 ('PRJ2024001', '基于AI的智能问答系统', 1, 2, 4, 2, '本项目旨在开发一个基于大语言模型的智能问答系统', 3),
 ('PRJ2024002', '校园二手交易平台', 2, 1, 5, 3, '搭建一个面向高校学生的二手物品交易平台', 1);
 
 -- 7. 项目成员
-INSERT INTO project_member (project_id, user_id, member_order, role) VALUES
+INSERT IGNORE INTO project_member (project_id, user_id, member_order, role) VALUES
 (1, 4, 1, 2),
 (1, 5, 2, 1),
 (2, 5, 1, 2),

backend/target/classes/db/migration/V2__add_user_unique_constraints.sql

@@ -0,0 +1,40 @@
+-- V2: 为 sys_user 表添加唯一约束
+-- 执行时间：2026-03-13
+
+-- 1. 先清理可能存在的重复数据（保留 ID 最小的记录）
+-- 删除重复的用户名（保留 id 最小的）
+DELETE FROM sys_user 
+WHERE id NOT IN (
+    SELECT id FROM (
+        SELECT MIN(id) as id
+        FROM sys_user
+        WHERE username IS NOT NULL
+        GROUP BY username
+    ) as tmp
+);
+
+-- 删除重复的邮箱（保留 id 最小的）
+DELETE FROM sys_user 
+WHERE id NOT IN (
+    SELECT id FROM (
+        SELECT MIN(id) as id
+        FROM sys_user
+        WHERE email IS NOT NULL
+        GROUP BY email
+    ) as tmp
+);
+
+-- 2. 为 username 添加唯一约束
+ALTER TABLE sys_user 
+ADD CONSTRAINT uk_username UNIQUE (username);
+
+-- 3. 为 email 添加唯一约束
+ALTER TABLE sys_user 
+ADD CONSTRAINT uk_email UNIQUE (email);
+
+-- 4. 为 phone 添加索引（不唯一，因为可能有没有手机号的情况）
+CREATE INDEX idx_phone ON sys_user(phone);
+
+-- 5. 为 role_type 和 status 添加索引，优化查询性能
+CREATE INDEX idx_role_type ON sys_user(role_type);
+CREATE INDEX idx_status ON sys_user(status);

backend/target/classes/schema.sql

@@ -16,7 +16,11 @@ CREATE TABLE IF NOT EXISTS sys_user (
   update_by BIGINT DEFAULT NULL,
   deleted TINYINT DEFAULT 0,
   PRIMARY KEY (id),
-  UNIQUE KEY uk_username (username)
+  UNIQUE KEY uk_username (username),
+  UNIQUE KEY uk_email (email),
+  KEY idx_phone (phone),
+  KEY idx_role_type (role_type),
+  KEY idx_status (status)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
 -- 创建学生信息表