- Move all DataModel item files to a new 'items' subfolder for better organization

- Add _module.mjs file to simplify imports
- Update all import paths
- Rename class for use the new acronym DH

module/data/items/domainCard.mjs

@@ -0,0 +1,24 @@
+import DaggerheartAction from "../action.mjs";
+
+export default class DHDomainCard extends foundry.abstract.TypeDataModel {
+    /** @inheritDoc */
+    static defineSchema() {
+        const fields = foundry.data.fields;
+        return {
+            domain: new fields.StringField(
+                { choices: SYSTEM.DOMAIN.domains, integer: false },
+                { required: true, initial: [] }
+            ),
+            level: new fields.NumberField({ initial: 1, integer: true }),
+            recallCost: new fields.NumberField({ initial: 0, integer: true }),
+            type: new fields.StringField(
+                { choices: SYSTEM.DOMAIN.cardTypes, integer: false },
+                { required: true, initial: [] }
+            ),
+            foundation: new fields.BooleanField({ initial: false }),
+            effect: new fields.HTMLField({}),
+            inVault: new fields.BooleanField({ initial: false }),
+            actions: new fields.ArrayField(new fields.EmbeddedDataField(DaggerheartAction))
+        };
+    }
+}