feat: add complete EnCoach frontend application

Full React 18 + TypeScript + Vite frontend with:
- 90+ pages (admin, student, teacher, public)
- shadcn/ui component library with 50+ components
- JWT authentication with role-based access control
- TanStack React Query for server state management
- 30+ API service modules
- AI-powered features (coaching, grading, generation)
- Adaptive learning UI (diagnostics, proficiency, plans)
- Institutional LMS management (courses, batches, timetable)
- Communication suite (discussions, announcements, DMs)
- Full CRUD with validation and confirmation dialogs

Made-with: Cursor

src/components/TeacherLayout.tsx

@@ -0,0 +1,42 @@
+import RoleLayout, { NavGroup } from "./RoleLayout";
+import {
+  LayoutDashboard, BookOpen, ClipboardList, FileText,
+  CalendarCheck, Users, Calendar, User, MessageSquare,
+  Megaphone, Wand2,
+} from "lucide-react";
+
+const navGroups: NavGroup[] = [
+  {
+    label: "Teaching",
+    items: [
+      { title: "Dashboard", url: "/teacher/dashboard", icon: LayoutDashboard },
+      { title: "Courses", url: "/teacher/courses", icon: BookOpen },
+      { title: "Assignments", url: "/teacher/assignments", icon: ClipboardList },
+    ],
+  },
+  {
+    label: "Management",
+    items: [
+      { title: "Attendance", url: "/teacher/attendance", icon: CalendarCheck },
+      { title: "Students", url: "/teacher/students", icon: Users },
+      { title: "Timetable", url: "/teacher/timetable", icon: Calendar },
+    ],
+  },
+  {
+    label: "Communication",
+    items: [
+      { title: "Discussions", url: "/teacher/discussions", icon: MessageSquare },
+      { title: "Announcements", url: "/teacher/announcements", icon: Megaphone },
+    ],
+  },
+  {
+    label: "Account",
+    items: [
+      { title: "Profile", url: "/teacher/profile", icon: User },
+    ],
+  },
+];
+
+export default function TeacherLayout() {
+  return <RoleLayout navGroups={navGroups} role="teacher" />;
+}