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

scripts/update.sh

@@ -30,8 +30,8 @@ success "Migrations applied"
 
 step "Rebuilding frontends"
 cd "$INSTALL_DIR"
-npm run build --workspace=whm --silent
-npm run build --workspace=cpanel --silent
+npm run build --workspace=nixserver --silent
+npm run build --workspace=nixclient --silent
 success "Frontends rebuilt"
 
 step "Rebuilding server"