feat(v3): restructure project + add complete frontend

- Restructure: move backend from new_project/ to backend/
- Add full React/TypeScript frontend (37 pages, 17 services, 16 type defs, 11 query hooks)
- Add docs/ with SRS specs, user stories, and workflow documentation
- Update .gitignore for new directory layout

Workflows implemented:
  WF1 User Signup, WF2 Placement Test, WF3 Exam Configuration,
  WF4 General English Exam, WF5 Course Generation,
  WF6 Entity Student Onboarding, AI Course Generation,
  Adaptive Learning Engine UI, White-Label Branding, Score Release

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" />;
+}