add thumbnail field to album model, update album retrieval to use POST method, and enhance album list component with dynamic fetching

backend/internal/models/album.go

@@ -15,6 +15,7 @@ type Album struct {
 	// Public albums have a default access level of 0 for all visitors, including guests.
 	// Private albums require a user with access to be logged in to view, or a magic link to be used.
 	ParentID  string `gorm:"not null"` // The ID of the parent album, if any. This is an empty string for root albums.
+	Thumbnail string `gorm:"not null"` // The media ID of the thumbnail for the album.
 	CreatedAt time.Time
 	UpdatedAt time.Time
 }

backend/internal/routes/album.go

@@ -9,7 +9,7 @@ import (
 
 func RegisterAlbumRoutes(rg *gin.RouterGroup) {
 	album := rg.Group("/albums")
-	album.GET("/getAlbumsInParent", func(c *gin.Context) {
+	album.POST("/getAlbumsInParent", func(c *gin.Context) {
 		accessToken := c.GetHeader("Authorization")
 		if accessToken == "" {
 			c.JSON(http.StatusUnauthorized, gin.H{"error": "Unauthorized"})

backend/internal/services/album.go

@@ -73,6 +73,7 @@ func CreateAlbum(accessToken string, title string, description string, parentID
 		Title:       title,
 		Description: description,
 		ParentID:    parentID,
+		Thumbnail:   "",
 	}
 	result := db.GetDB().Create(&album)
 	if result.Error != nil {