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/mixins/base.go

@@ -0,0 +1,42 @@
+package mixins
+
+import (
+	"time"
+
+	"entgo.io/ent"
+	"entgo.io/ent/schema/field"
+	"entgo.io/ent/schema/mixin"
+	"github.com/google/uuid"
+)
+
+type BaseMixin struct {
+	mixin.Schema
+}
+
+func (BaseMixin) Fields() []ent.Field {
+	return []ent.Field{
+		field.UUID("id", uuid.UUID{}).
+			Default(uuid.New),
+		field.Time("created_at").
+			Immutable().
+			Default(time.Now),
+		field.Time("updated_at").
+			Default(time.Now).
+			UpdateDefault(time.Now),
+	}
+}
+
+type DetailsMixin struct {
+	mixin.Schema
+}
+
+func (DetailsMixin) Fields() []ent.Field {
+	return []ent.Field{
+		field.String("name").
+			MaxLen(255).
+			NotEmpty(),
+		field.String("description").
+			MaxLen(1000).
+			Optional(),
+	}
+}