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/predicate/predicate.go

@@ -0,0 +1,40 @@
+// Code generated by ent, DO NOT EDIT.
+
+package predicate
+
+import (
+	"entgo.io/ent/dialect/sql"
+)
+
+// Attachment is the predicate function for attachment builders.
+type Attachment func(*sql.Selector)
+
+// AuthTokens is the predicate function for authtokens builders.
+type AuthTokens func(*sql.Selector)
+
+// Document is the predicate function for document builders.
+type Document func(*sql.Selector)
+
+// DocumentToken is the predicate function for documenttoken builders.
+type DocumentToken func(*sql.Selector)
+
+// Group is the predicate function for group builders.
+type Group func(*sql.Selector)
+
+// GroupInvitationToken is the predicate function for groupinvitationtoken builders.
+type GroupInvitationToken func(*sql.Selector)
+
+// Item is the predicate function for item builders.
+type Item func(*sql.Selector)
+
+// ItemField is the predicate function for itemfield builders.
+type ItemField func(*sql.Selector)
+
+// Label is the predicate function for label builders.
+type Label func(*sql.Selector)
+
+// Location is the predicate function for location builders.
+type Location func(*sql.Selector)
+
+// User is the predicate function for user builders.
+type User func(*sql.Selector)