refactor: remove empty services (#116)

* remove empty services

* remove old factory

* remove old static files

* cleanup more duplicate service code

* file/folder reorg

backend/internal/data/ent/schema/attachment.go

@@ -0,0 +1,42 @@
+package schema
+
+import (
+	"entgo.io/ent"
+	"entgo.io/ent/schema/edge"
+	"entgo.io/ent/schema/field"
+	"github.com/hay-kot/homebox/backend/internal/data/ent/schema/mixins"
+)
+
+// Attachment holds the schema definition for the Attachment entity.
+type Attachment struct {
+	ent.Schema
+}
+
+func (Attachment) Mixin() []ent.Mixin {
+	return []ent.Mixin{
+		mixins.BaseMixin{},
+	}
+}
+
+// Fields of the Attachment.
+func (Attachment) Fields() []ent.Field {
+	return []ent.Field{
+		field.Enum("type").
+			Values("photo", "manual", "warranty", "attachment", "receipt").
+			Default("attachment"),
+	}
+}
+
+// Edges of the Attachment.
+func (Attachment) Edges() []ent.Edge {
+	return []ent.Edge{
+		edge.From("item", Item.Type).
+			Ref("attachments").
+			Required().
+			Unique(),
+		edge.From("document", Document.Type).
+			Ref("attachments").
+			Required().
+			Unique(),
+	}
+}