feat(gateway): 补齐桌面端高级媒体直连接口

新增图片矢量化、视频超分、每日用量、计价与任务隔离能力，并通过环境变量解析平台凭据。

已通过 Go 全量门禁、迁移检查、镜像构建以及 Vectorizer 五格式和 Topaz 3 秒视频真实 DEV 验收。

apps/api/internal/httpapi/model_catalog.go

@@ -1141,6 +1141,10 @@ func canonicalCapabilityFilterValue(value string) string {
 		return "text_embedding"
 	case "rerank", "reranks":
 		return "text_rerank"
+	case "vectorize", "image_vectorizer":
+		return "image_vectorize"
+	case "video_upscale", "upscale":
+		return "video_enhance"
 	case "model":
 		return "model_3d"
 	default:
@@ -1164,6 +1168,10 @@ func capabilityFilterValueForTag(tag string) string {
 		return "structured_output"
 	case "数字人":
 		return "digital_human"
+	case "图片矢量化":
+		return "image_vectorize"
+	case "视频增强":
+		return "video_enhance"
 	case "重排序":
 		return "text_rerank"
 	case "3D 模型":
@@ -1194,11 +1202,13 @@ func capabilityLabel(value string) string {
 		"image_generate":      "图像生成",
 		"image_edit":          "图像编辑",
 		"image_analysis":      "图像分析",
+		"image_vectorize":     "图片矢量化",
 		"video_generate":      "视频生成",
 		"image_to_video":      "图生视频",
 		"text_to_video":       "文生视频",
 		"video_edit":          "视频编辑",
 		"video_understanding": "视频理解",
+		"video_enhance":       "视频增强",
 		"audio_generate":      "音频生成",
 		"text_to_speech":      "语音合成",
 		"voice_clone":         "音色克隆",