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

nixserver/src/index.css

@@ -0,0 +1,47 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+@layer base {
+  :root {
+    --bg-primary: #0f1117;
+    --bg-secondary: #1a1d27;
+    --bg-card: #1e2130;
+    --border: #2a2d3e;
+    --text-primary: #e2e8f0;
+    --text-muted: #64748b;
+    --accent: #6366f1;
+    --accent-hover: #4f46e5;
+    --success: #10b981;
+    --warning: #f59e0b;
+    --danger: #ef4444;
+  }
+}
+
+* {
+  box-sizing: border-box;
+}
+
+body {
+  margin: 0;
+  background-color: var(--bg-primary);
+  color: var(--text-primary);
+  font-family: 'Inter', system-ui, -apple-system, sans-serif;
+  font-size: 14px;
+  line-height: 1.5;
+}
+
+::-webkit-scrollbar {
+  width: 6px;
+  height: 6px;
+}
+::-webkit-scrollbar-track {
+  background: var(--bg-secondary);
+}
+::-webkit-scrollbar-thumb {
+  background: var(--border);
+  border-radius: 3px;
+}
+::-webkit-scrollbar-thumb:hover {
+  background: #3a3d4e;
+}