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>

packages/db/src/helpers/execute-bootstrap.ts

@@ -7,7 +7,7 @@
 
 import type { Database } from "@reviq/db-schema";
 import type { Kysely, Transaction } from "kysely";
-import { hashPassword } from "@reviq/utils";
+import { hashPassword } from "@reviq/server-utils";
 import { generateToken, hashToken } from "./token.js";
 
 /**