Rename @reviq/utils to @reviq/server-utils and add package READMEs

- Rename packages/utils/ to packages/server-utils/
- Update all imports and package.json references
- Add READMEs for frontend-utils, server-utils, and common packages
- Update main README with new package structure

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

db/schema.sql

@@ -1,3 +1,4 @@
+\restrict QhAmrcKtCrf6P0ZFpXVcs0q7Otge0aJb6nxv7mivONqZesSRXpctyFKRRYQlfqj
 
 -- Dumped from database version 17.7
 -- Dumped by pg_dump version 17.7
@@ -1083,6 +1084,7 @@ ALTER TABLE ONLY public.user_devices
 -- PostgreSQL database dump complete
 --
 
+\unrestrict QhAmrcKtCrf6P0ZFpXVcs0q7Otge0aJb6nxv7mivONqZesSRXpctyFKRRYQlfqj
 
 
 --