feat: 管理端重置用户密码，生成8位随机字符串并返回

src/main/java/com/cool/modules/user/controller/admin/AdminUserInfoController.java

@@ -60,6 +60,14 @@ public class AdminUserInfoController extends BaseController<UserInfoService, Use
         return R.ok();
     }
 
+    @Operation(summary = "重置用户密码")
+    @PostMapping("/resetPassword")
+    public R resetPassword(@RequestBody JSONObject requestParams) {
+        Long id = requestParams.getLong("id");
+        String newPassword = userInfoService.resetPassword(id);
+        return R.ok(newPassword);
+    }
+
     @Override
     @PostMapping("/delete")
     protected R delete(HttpServletRequest request, @RequestBody Map<String, Object> params,

src/main/java/com/cool/modules/user/service/UserInfoService.java

@@ -45,4 +45,6 @@ public interface UserInfoService extends BaseService<UserInfoEntity> {
      * 删除前校验：必须已注销
      */
     void checkLogoffBeforeDelete(Long userId);
+
+    String resetPassword(Long userId);
 }

src/main/java/com/cool/modules/user/service/impl/UserInfoServiceImpl.java

@@ -1,6 +1,7 @@
 package com.cool.modules.user.service.impl;
 
 import cn.hutool.core.util.ObjUtil;
+import cn.hutool.core.util.RandomUtil;
 import cn.hutool.crypto.digest.MD5;
 import com.cool.core.base.BaseServiceImpl;
 import com.cool.core.exception.CoolPreconditions;
@@ -101,4 +102,14 @@ public class UserInfoServiceImpl extends BaseServiceImpl<UserInfoMapper, UserInf
         info.setUsername(username);
         info.updateById();
     }
+
+    @Override
+    public String resetPassword(Long userId) {
+        UserInfoEntity info = getById(userId);
+        CoolPreconditions.checkEmpty(info, "用户不存在");
+        String newPassword = RandomUtil.randomString(8);
+        info.setPassword(MD5.create().digestHex(newPassword));
+        info.updateById();
+        return newPassword;
+    }
 }