feat: Add Claude Code terminal integration to dashboard

- Add embedded Claude Code terminal with xterm.js for full CLI experience
- Create WebSocket PTY backend for real-time terminal communication
- Add terminal status endpoint to check CLI availability
- Update dashboard to use Claude Code terminal instead of API chat
- Add optimization control panel with start/stop/validate actions
- Add study context provider for global state management
- Update frontend with new dependencies (xterm.js addons)
- Comprehensive README documentation for all new features

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

atomizer-dashboard/frontend/src/App.tsx

@@ -1,25 +1,38 @@
-import { BrowserRouter, Routes, Route, Navigate } from 'react-router-dom';
+import { BrowserRouter, Routes, Route } from 'react-router-dom';
 import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
+import { StudyProvider } from './context/StudyContext';
 import { MainLayout } from './components/layout/MainLayout';
+import Home from './pages/Home';
 import Dashboard from './pages/Dashboard';
-import Configurator from './pages/Configurator';
 import Results from './pages/Results';
 
-const queryClient = new QueryClient();
+const queryClient = new QueryClient({
+  defaultOptions: {
+    queries: {
+      staleTime: 5000,
+      refetchOnWindowFocus: false,
+    },
+  },
+});
 
 function App() {
   return (
     <QueryClientProvider client={queryClient}>
-      <BrowserRouter>
-        <Routes>
-          <Route path="/" element={<MainLayout />}>
-            <Route index element={<Navigate to="/dashboard" replace />} />
-            <Route path="dashboard" element={<Dashboard />} />
-            <Route path="configurator" element={<Configurator />} />
-            <Route path="results" element={<Results />} />
-          </Route>
-        </Routes>
-      </BrowserRouter>
+      <StudyProvider>
+        <BrowserRouter>
+          <Routes>
+            {/* Home page - no sidebar layout */}
+            <Route path="/" element={<Home />} />
+
+            {/* Study pages - with sidebar layout */}
+            <Route element={<MainLayout />}>
+              <Route path="dashboard" element={<Dashboard />} />
+              <Route path="results" element={<Results />} />
+              <Route path="analytics" element={<Dashboard />} />
+            </Route>
+          </Routes>
+        </BrowserRouter>
+      </StudyProvider>
     </QueryClientProvider>
   );
 }