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>

apps/api-server/package.json

@@ -19,7 +19,7 @@
     "@reviq/api-contract": "workspace:*",
     "@reviq/db": "workspace:*",
     "@reviq/db-schema": "workspace:*",
-    "@reviq/utils": "workspace:*",
+    "@reviq/server-utils": "workspace:*",
     "@scure/base": "^2.0.0",
     "@simplewebauthn/server": "^13.2.2",
     "@simplewebauthn/types": "^12.0.0",

apps/api-server/src/utils/crypto.ts

@@ -1,4 +1,4 @@
-import { generateSecureBase58Token } from "@reviq/utils";
+import { generateSecureBase58Token } from "@reviq/server-utils";
 import { base58 } from "@scure/base";
 
 // Re-export for convenience

apps/api-server/src/utils/password.ts

@@ -1,7 +1,7 @@
 import {
   hashPassword as hashPasswordUtil,
   verifyPassword as verifyPasswordUtil,
-} from "@reviq/utils";
+} from "@reviq/server-utils";
 import zxcvbn from "zxcvbn";
 
 export interface PasswordValidationResult {