feat: asset tags/ids (#142)

* add schema

* run db migration

* bulk seed asset IDs

* breaking: update runtime options

* conditionally increment asset IDs

* update API endpoints

* fix import asset id assignment

* refactor display + marshal/unmarshal

* add docs page

* add to form field

* hide 000-000 values

* update ENV vars

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

@@ -29,6 +29,7 @@ func (Item) Indexes() []ent.Index {
 		index.Fields("model_number"),
 		index.Fields("serial_number"),
 		index.Fields("archived"),
+		index.Fields("asset_id"),
 	}
 }
 
@@ -48,6 +49,8 @@ func (Item) Fields() []ent.Field {
 			Default(false),
 		field.Bool("archived").
 			Default(false),
+		field.Int("asset_id").
+			Default(0),
 
 		// ------------------------------------
 		// item identification