feat: 添加媒体资源管理相关API接口及数据结构，包括列表和详情查询

backend/app/http/tenant/dto/media_asset_admin_list.go

@@ -0,0 +1,29 @@
+package dto
+
+import (
+	"time"
+
+	"quyun/v2/app/requests"
+	"quyun/v2/pkg/consts"
+)
+
+// AdminMediaAssetListFilter defines tenant-admin list query filters for media assets.
+type AdminMediaAssetListFilter struct {
+	// Pagination defines page/limit; page is 1-based, limit uses the global whitelist.
+	requests.Pagination `json:",inline" query:",inline"`
+
+	// SortQueryFilter defines asc/desc ordering; service layer applies a whitelist.
+	requests.SortQueryFilter `json:",inline" query:",inline"`
+
+	// Type filters by media type (video/audio/image); optional.
+	Type *consts.MediaAssetType `json:"type,omitempty" query:"type"`
+
+	// Status filters by processing status (uploaded/processing/ready/failed/deleted); optional.
+	Status *consts.MediaAssetStatus `json:"status,omitempty" query:"status"`
+
+	// CreatedAtFrom filters assets by created_at >= this time; optional.
+	CreatedAtFrom *time.Time `json:"created_at_from,omitempty" query:"created_at_from"`
+
+	// CreatedAtTo filters assets by created_at <= this time; optional.
+	CreatedAtTo *time.Time `json:"created_at_to,omitempty" query:"created_at_to"`
+}