chore: add buildOutput RTK filter, drop legacy cloud sync, internal cleanup

- feat(rtk): buildOutput filter + autodetect for npm/yarn/cargo logs
- chore: remove unused cloud sync module and related routes
- ui: hide deprecated providers (qwen, iflow, antigravity)
- chore: minor tray/cli/internal adjustments

src/app/api/init/route.js

@@ -1,7 +1,4 @@
-// Auto-initialize cloud sync when server starts
-import "@/lib/initCloudSync";
-
-// This API route is called automatically to initialize sync
+// This API route is called automatically to initialize app
 export async function GET() {
   return new Response("Initialized", { status: 200 });
 }