feat: items-editor (#5)

* format readme

* update logo

* format html

* add logo to docs

* repository for document and document tokens

* add attachments type and repository

* autogenerate types via scripts

* use autogenerated types

* attachment type updates

* add insured and quantity fields for items

* implement HasID interface for entities

* implement label updates for items

* implement service update method

* WIP item update client side actions

* check err on attachment

* finish types for basic items editor

* remove unused var

* house keeping

backend/internal/repo/id_set.go

@@ -0,0 +1,62 @@
+package repo
+
+import "github.com/google/uuid"
+
+// HasID is an interface to entities that have an ID uuid.UUID field and a GetID() method.
+// This interface is fulfilled by all entities generated by entgo.io/ent via a custom template
+type HasID interface {
+	GetID() uuid.UUID
+}
+
+// IDSet is a utility set-like type for working with sets of uuid.UUIDs within a repository
+// instance. Most useful for comparing lists of UUIDs for processing relationship
+// IDs and remove/adding relationships as required.
+//
+// # See how ItemRepo uses it to manage the Labels-To-Items relationship
+//
+// NOTE: may be worth moving this to a more generic package/set implementation
+// or use a 3rd party set library, but this is good enough for now
+type IDSet struct {
+	mp map[uuid.UUID]struct{}
+}
+
+func NewIDSet(l int) *IDSet {
+	return &IDSet{
+		mp: make(map[uuid.UUID]struct{}, l),
+	}
+}
+
+func EntitiesToIDSet[T HasID](entities []T) *IDSet {
+	s := NewIDSet(len(entities))
+	for _, e := range entities {
+		s.Add(e.GetID())
+	}
+	return s
+}
+
+func (t *IDSet) Slice() []uuid.UUID {
+	s := make([]uuid.UUID, 0, len(t.mp))
+	for k := range t.mp {
+		s = append(s, k)
+	}
+	return s
+}
+
+func (t *IDSet) Add(ids ...uuid.UUID) {
+	for _, id := range ids {
+		t.mp[id] = struct{}{}
+	}
+}
+
+func (t *IDSet) Has(id uuid.UUID) bool {
+	_, ok := t.mp[id]
+	return ok
+}
+
+func (t *IDSet) Len() int {
+	return len(t.mp)
+}
+
+func (t *IDSet) Remove(id uuid.UUID) {
+	delete(t.mp, id)
+}