feat(API): media field type

api/handlers/media/mediaHandler.go

@@ -92,9 +92,27 @@ func intQueryParam(values url.Values, name string, fallback int) (int, error) {
 type usageResponse struct {
 	Type      string   `json:"type"`
 	ID        uint32   `json:"id"`
-	Title     string   `json:"title"`
+	Title     string   `json:"title,omitempty"`
 	Published *bool    `json:"published,omitempty"`
 	Fields    []string `json:"fields"`
+
+	ContentTypeKey  string               `json:"content_type_key,omitempty"`
+	ContentTypeName string               `json:"content_type_name,omitempty"`
+	FirstField      *usageFirstFieldBody `json:"first_field,omitempty"`
+}
+
+type usageFirstFieldBody struct {
+	Key   string `json:"key"`
+	Type  string `json:"type"`
+	Value any    `json:"value"`
+}
+
+func toUsageResponse(usage useCases.MediaUsage) usageResponse {
+	body := usageResponse{Type: usage.Type, ID: usage.ID, Title: usage.Title, Published: usage.Published, Fields: usage.Fields, ContentTypeKey: usage.ContentTypeKey, ContentTypeName: usage.ContentTypeName}
+	if usage.FirstField != nil {
+		body.FirstField = &usageFirstFieldBody{Key: usage.FirstField.Key, Type: string(usage.FirstField.Type), Value: usage.FirstField.Value}
+	}
+	return body
 }
 
 type mergeResponse struct {
@@ -347,7 +365,7 @@ func (h *Handler) Usage(w http.ResponseWriter, r *http.Request) {
 
 	response := make([]usageResponse, 0, len(usages))
 	for _, usage := range usages {
-		response = append(response, usageResponse{Type: usage.Type, ID: usage.ID, Title: usage.Title, Published: usage.Published, Fields: usage.Fields})
+		response = append(response, toUsageResponse(usage))
 	}
 	writeJSON(w, http.StatusOK, response)
 }