refactor: update import paths to use internal package

internal/manga/page_container.go

@@ -0,0 +1,19 @@
+package manga
+
+import "image"
+
+// PageContainer is a struct that holds a manga page, its image, and the image format.
+type PageContainer struct {
+	// Page is a pointer to a manga page object.
+	Page *Page
+	// Image is the decoded image of the manga page.
+	Image image.Image
+	// Format is a string representing the format of the image (e.g., "png", "jpeg", "webp").
+	Format string
+	// IsToBeConverted is a boolean flag indicating whether the image needs to be converted to another format.
+	IsToBeConverted bool
+}
+
+func NewContainer(Page *Page, img image.Image, format string, isToBeConverted bool) *PageContainer {
+	return &PageContainer{Page: Page, Image: img, Format: format, IsToBeConverted: isToBeConverted}
+}