feat: rename WHM→NixServer, cPanel→NixClient, bump v0.2.0

- Rename frontend workspaces: whm/ → nixserver/, cpanel/ → nixclient/
- Rename server route dirs: routes/whm/ → routes/nixserver/, routes/cpanel/ → routes/nixclient/
- Update all API prefixes: /api/whm → /api/nixserver, /api/cpanel → /api/nixclient
- Rename env vars: WHM_PORT → NIXSERVER_PORT, CPANEL_PORT → NIXCLIENT_PORT
- Update config properties: whmPort → nixserverPort, cpanelPort → nixclientPort
- Update all UI labels, login pages, sidebar branding, and error messages
- Update installer and update scripts to match new names
- Add cpanel email route (missing from initial scaffold)
- Add .gitattributes to enforce LF line endings
- Bump version to 0.2.0 across all package.json files

package.json

@@ -1,18 +1,18 @@
 {
   "name": "nixpanel-server",
-  "version": "0.1.0",
+  "version": "0.2.0",
   "private": true,
   "workspaces": [
     "server",
-    "whm",
-    "cpanel"
+    "nixserver",
+    "nixclient"
   ],
   "scripts": {
-    "dev": "concurrently \"npm run dev --workspace=server\" \"npm run dev --workspace=whm\" \"npm run dev --workspace=cpanel\"",
+    "dev": "concurrently \"npm run dev --workspace=server\" \"npm run dev --workspace=nixserver\" \"npm run dev --workspace=nixclient\"",
     "dev:server": "npm run dev --workspace=server",
-    "dev:whm": "npm run dev --workspace=whm",
-    "dev:cpanel": "npm run dev --workspace=cpanel",
-    "build": "npm run build --workspace=server && npm run build --workspace=whm && npm run build --workspace=cpanel",
+    "dev:nixserver": "npm run dev --workspace=nixserver",
+    "dev:nixclient": "npm run dev --workspace=nixclient",
+    "build": "npm run build --workspace=server && npm run build --workspace=nixserver && npm run build --workspace=nixclient",
     "db:migrate": "npm run db:migrate --workspace=server",
     "db:studio": "npm run db:studio --workspace=server"
   },