fix: register 0004_document_source_scope migration in drizzle journal

The migration file was added by feat/aiia-66-source-selection but was not
registered in _journal.json, so it never runs on deploy. This caused
'source_scope' column-missing errors on document insert.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

drizzle/meta/_journal.json

@@ -29,6 +29,13 @@
       "when": 1775775900000,
       "tag": "0003_tenant_api_keys",
       "breakpoints": true
+    },
+    {
+      "idx": 4,
+      "version": "7",
+      "when": 1775856000000,
+      "tag": "0004_document_source_scope",
+      "breakpoints": true
     }
   ]
 }