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/server-utils/package.json

@@ -0,0 +1,27 @@
+{
+  "name": "@reviq/server-utils",
+  "version": "0.0.1",
+  "type": "module",
+  "main": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.js"
+    }
+  },
+  "scripts": {
+    "build": "tsc",
+    "clean": "tsc --build --clean && rm -rf dist/ node_modules/ .eslintcache",
+    "lint": "eslint . --cache",
+    "test": "bun test src/"
+  },
+  "devDependencies": {
+    "@cloudflare/workers-types": "^4.20250529.0",
+    "@macalinao/eslint-config": "catalog:",
+    "@macalinao/tsconfig": "catalog:",
+    "@types/bun": "catalog:",
+    "eslint": "catalog:",
+    "typescript": "catalog:"
+  }
+}