feat: 首页素材点击查看详情，支持下载

- 后端 GetRecentAssets 增加 projectName/width/height/projectId 字段
- 前端 AssetGallery 点击图片弹出详情弹窗：提示词/工程/分辨率/格式
- 详情弹窗提供下载按钮，走 /api/v1/assets/download?key= 接口

backend/internal/handler/generate.go

@@ -308,14 +308,18 @@ func getTaskDBID(ctx context.Context, taskID string) uint {
 
 // RecentAssetItem 首页素材展示项。
 type RecentAssetItem struct {
-	Key       string `json:"key"`
-	URL       string `json:"url"`
-	Format    string `json:"format"`
-	Prompt    string `json:"prompt"`
-	AssetType string `json:"assetType"`
-	MetaType  string `json:"metaType"` // frame / spritesheet / preview
-	TaskID    string `json:"taskId"`
-	CreatedAt string `json:"createdAt"`
+	Key         string `json:"key"`
+	URL         string `json:"url"`
+	Format      string `json:"format"`
+	Prompt      string `json:"prompt"`
+	AssetType   string `json:"assetType"`
+	MetaType    string `json:"metaType"`
+	TaskID      string `json:"taskId"`
+	ProjectID   string `json:"projectId"`
+	ProjectName string `json:"projectName"`
+	Width       int    `json:"width"`
+	Height      int    `json:"height"`
+	CreatedAt   string `json:"createdAt"`
 }
 
 // GetRecentAssets 获取最近生成的素材列表（已完成任务的全部素材）。
@@ -323,23 +327,31 @@ func GetRecentAssets(c *gin.Context) {
 	limit := 60
 
 	var dbRows []struct {
-		Key       string
-		URL       string
-		Format    string
-		Prompt    string
-		AssetType string
-		MetaType  string
-		TaskID    string
-		ProjectID uint
-		CreatedAt string
+		Key         string
+		URL         string
+		Format      string
+		Prompt      string
+		AssetType   string
+		MetaType    string
+		TaskID      string
+		ProjectID   uint
+		ProjectName string
+		Width       int
+		Height      int
+		CreatedAt   string
 	}
 
 	db.GetDB().WithContext(c.Request.Context()).
 		Raw(`SELECT a.key, a.url, a.format, t.prompt, t.asset_type as asset_type,
 			COALESCE(json_extract(a.metadata, '$.type'), 'frame') as meta_type,
-			t.external_id as task_id, t.project_id, t.created_at as created_at
+			t.external_id as task_id, t.project_id,
+			p.name as project_name,
+			CAST(COALESCE(json_extract(t.metadata, '$.frameWidth'), '0') AS INTEGER) as width,
+			CAST(COALESCE(json_extract(t.metadata, '$.frameHeight'), '0') AS INTEGER) as height,
+			t.created_at as created_at
 			FROM assets a
 			INNER JOIN tasks t ON a.task_id = t.id
+			INNER JOIN projects p ON t.project_id = p.id
 			WHERE t.status = 'completed'
 			ORDER BY a.created_at DESC
 			LIMIT ?`, limit).
@@ -348,14 +360,18 @@ func GetRecentAssets(c *gin.Context) {
 	result := make([]RecentAssetItem, len(dbRows))
 	for i, r := range dbRows {
 		result[i] = RecentAssetItem{
-			Key:       r.Key,
-			URL:       storageSvc.GetSignedURL(r.Key),
-			Format:    r.Format,
-			Prompt:    r.Prompt,
-			AssetType: r.AssetType,
-			MetaType:  r.MetaType,
-			TaskID:    r.TaskID,
-			CreatedAt: r.CreatedAt,
+			Key:         r.Key,
+			URL:         storageSvc.GetSignedURL(r.Key),
+			Format:      r.Format,
+			Prompt:      r.Prompt,
+			AssetType:   r.AssetType,
+			MetaType:    r.MetaType,
+			TaskID:      r.TaskID,
+			ProjectID:   fmt.Sprintf("%d", r.ProjectID),
+			ProjectName: r.ProjectName,
+			Width:       r.Width,
+			Height:      r.Height,
+			CreatedAt:   r.CreatedAt,
 		}
 	}