test(invoice): add integration tests for invoice behaviors

- Fix schema ordering: move :journal-entry-line/running-balance to schema.edn
- Add invoice_behaviors_test.clj covering:
  - Permission gates (26.5, 26.6, 26.8)
  - Lock date blocking (27.1, 27.3)
  - New invoice validation (8.1, 8.5)
  - Edit invoice (11.1, 11.3)
  - Bulk edit (15.4)
  - Single/bulk void (16.3, 16.4, 17.1)
  - Unvoid restoring from history (18.1)
  - Undo autopay (19.1)
  - Invoice list filtering (2.6, 2.8, 2.10, 2.14)
  - Invoice list sorting (3.5, 3.7, 3.10)
  - Invoice list pagination (4.1, 4.3)
  - Legacy route redirects (28.1)
- Mock Solr in wrap-setup fixture to prevent Connection refused
- Fix setup-test-data to merge user-provided entities with defaults
- Fix InMemSolrClient.index_documents to handle entity IDs
- Fix ezcater_xls test to use dynamic entity IDs
- Update invoice.md behavior checklist with completed items

src/clj/auto_ap/solr.clj

@@ -213,8 +213,9 @@
            (fn [data-set]
              (reduce
               (fn [data-set x]
-                (let [thing (datomic->solr x)]
-                  (update data-set index conj [(str/join " " (vals x)) thing])))
+                (if-let [thing (datomic->solr x)]
+                  (update data-set index conj [(str/join " " (map str (vals thing))) thing])
+                  data-set))
               data-set
               xs)))
     nil)