chore: relocate backend into apps/api ahead of monorepo merge

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/api/models/task/task.attributes.js

@@ -0,0 +1,20 @@
+const excludeAttributes = [];
+
+const adminExclude = [
+  ...excludeAttributes,
+  // admins can see audit fields, so nothing extra excluded
+];
+
+const userExclude = [
+  ...excludeAttributes,
+  // regular users cannot see audit trails
+  "createdBy", "updatedBy", "deletedBy", "deletedAt",
+];
+
+const jsonbSchemas = {};
+
+const computedAttributes = [];
+
+const filterableFields = {}
+
+module.exports = { adminExclude, userExclude, excludeAttributes, jsonbSchemas, computedAttributes, filterableFields };