feat: 为 Batch 1 请求 DTO 补全 @Schema 中文描述注解

13 个 DTO 共补全 73 个字段的中文描述：
- 认证相关: LoginRequest, RegisterRequest, ResetPasswordRequest, RefreshTokenRequest
- 管理员相关: AdminLoginRequest, AdminCreateRequest, AdminUpdateRequest, AdminPageRequest
- 用户相关: UserCreateRequest, UserUpdateRequest, UserPageRequest, UserProfileUpdateRequest
- 分析相关: AnalyticsQueryRequest

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend-single/src/main/java/com/emotion/dto/request/AdminLoginRequest.java

@@ -1,5 +1,6 @@
 package com.emotion.dto.request;
 
+import io.swagger.v3.oas.annotations.media.Schema;
 import lombok.Data;
 
 import javax.validation.constraints.NotBlank;
@@ -19,12 +20,14 @@ public class AdminLoginRequest {
      */
     @NotBlank(message = "账号不能为空")
     @Size(min = 3, max = 50, message = "账号长度必须在3-50个字符之间")
+    @Schema(description = "管理员账号")
     private String account;
-    
+
     /**
      * 密码
      */
     @NotBlank(message = "密码不能为空")
     @Size(min = 6, max = 20, message = "密码长度必须在6-20个字符之间")
+    @Schema(description = "管理员密码")
     private String password;
 }