refactor: 拆分微信API到独立项目并迁移相关代码

1.  新增WeChatApi独立项目，将原WebApi中的微信相关控制器迁移至新项目
2.  新增后台权限管理相关实体、服务接口和基础控制器
3.  完善管理员用户服务，增加角色关联查询和赋值逻辑
4.  修复WebApi Swagger文档过滤微信API版本的问题
5.  更新解决方案文件，添加新的微信API项目引用
6.  新增微信API基础配置文件和项目属性配置

QYZH.InteractiveMagazine.WeChatApi/Controllers/BagController.cs

@@ -0,0 +1,52 @@
+using Microsoft.AspNetCore.Mvc;
+using QYZH.InteractiveMagazine.IService;
+using QYZH.InteractiveMagazine.Models.Dto;
+using QYZH.InteractiveMagazine.Models.Dto.Bag;
+
+namespace QYZH.InteractiveMagazine.WeChatApi.Controllers;
+
+/// <summary>
+/// 小程序背包控制器
+/// </summary>
+public class BagController(IWxMallService mallService, ILogger<BagController> logger) : WeChatBaseController
+{
+    /// <summary>
+    /// 获取背包物品列表
+    /// </summary>
+    /// <param name="itemType">物品类型筛选（可选）: MakeUpCard, PetBg</param>
+    [HttpGet("items")]
+    public async Task<BaseResponse<List<UserBagOutput>>> GetBagItems([FromQuery] string? itemType = null)
+    {
+        var userId = GetCurrentUserId();
+        if (userId == 0) return Fail("未获取到用户信息") as dynamic;
+
+        var items = await mallService.GetBagItemsAsync(userId, itemType);
+        return Success(items);
+    }
+
+    /// <summary>
+    /// 使用背包物品（补签卡等消耗品）
+    /// </summary>
+    [HttpPost("useItem")]
+    public async Task<BaseResponse<UseItemOutput>> UseItem([FromBody] UseItemInput input)
+    {
+        var userId = GetCurrentUserId();
+        if (userId == 0) return Fail("未获取到用户信息") as dynamic;
+
+        var result = await mallService.UseItemAsync(userId, input);
+        return Success(result);
+    }
+
+    /// <summary>
+    /// 宠物换肤
+    /// </summary>
+    [HttpPost("equipSkin")]
+    public async Task<BaseResponse<object>> EquipSkin([FromBody] EquipSkinInput input)
+    {
+        var userId = GetCurrentUserId();
+        if (userId == 0) return Fail("未获取到用户信息") as dynamic;
+
+        await mallService.EquipSkinAsync(userId, input);
+        return Success<object>(null!, input.SkinId == 0 ? "已恢复默认皮肤" : "换肤成功");
+    }
+}