Extend system search to include local e-conomic customer index fields, synonym expansion (e.g., rabat -> discount), and enhanced entity matching. Update OpenAPI spec, unit tests, and cron sync tasks accordingly.

services/nginx/app/tests/Unit/Search/SystemSearchOpenApiSpecTest.php

@@ -41,3 +41,10 @@ it('documents debug_intent and parser metadata schema in openapi', function ():
     expect($content)->toContain('intent_parser:');
     expect($content)->toContain('SystemSearchResponse:');
 });
+
+it('documents e-conomic indexed customer matching and synonym behavior', function (): void {
+    $content = system_search_openapi_content_or_skip();
+
+    expect($content)->toContain('local e-conomic customer index');
+    expect($content)->toContain('`rabat` -> `discount`');
+});