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/store/pricing_rules.go

@@ -331,7 +331,7 @@ ORDER BY priority ASC, resource_type ASC, rule_key ASC`, id)
 			return EffectivePricingConfig{}, fmt.Errorf("pricing rule %s currency does not match its rule set", ruleKey)
 		}
 		switch calculatorType {
-		case "token_usage", "unit_weight", "duration_weight":
+		case "token_usage", "unit_weight", "duration_weight", "transition_matrix":
 		default:
 			return EffectivePricingConfig{}, fmt.Errorf("pricing rule %s uses unsupported calculator %s", ruleKey, calculatorType)
 		}
@@ -386,8 +386,12 @@ func ValidateEffectivePricingRuleShape(resourceType string, unit string, calcula
 		allowed = unit == "1k_tokens" && calculatorType == "token_usage"
 	case "image", "image_edit":
 		allowed = unit == "image" && calculatorType == "unit_weight"
+	case "image_vectorize":
+		allowed = unit == "conversion" && calculatorType == "unit_weight"
 	case "video":
 		allowed = unit == "5s" && calculatorType == "duration_weight"
+	case "video_enhance":
+		allowed = unit == "5s" && calculatorType == "transition_matrix"
 	case "music":
 		allowed = (unit == "song" || unit == "item") && calculatorType == "unit_weight"
 	case "audio":
@@ -415,6 +419,8 @@ func DefaultEffectivePricingCalculator(resourceType string) string {
 		return "token_usage"
 	case "video":
 		return "duration_weight"
+	case "video_enhance":
+		return "transition_matrix"
 	default:
 		return "unit_weight"
 	}