feat: Ford legacy support, EMEX browser pooling, collapsible sidebar

- Add PL24 Ford legacy service for fordt_parts architecture
- Refactor EMEX to use persistent browser pool instead of per-call instances
- Make vehicle decode resilient: fallback to PL24 when Corgi doesn't recognize VIN
- Add collapsible sidebar with persistent user preference
- Improve brand access guard and categories service
- Add debug/test scripts for VIN e2e testing

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/api/src/integrations/emex/emex.module.ts

@@ -1,8 +1,9 @@
 import { Module } from "@nestjs/common";
+import { EmexBrowserService } from "./emex.browser";
 import { EmexService } from "./emex.service";
 
 @Module({
-  providers: [EmexService],
+  providers: [EmexBrowserService, EmexService],
   exports: [EmexService],
 })
 export class EmexModule {}