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

frontend/src/pages/NotFound.tsx

@@ -0,0 +1,24 @@
+import { useLocation } from "react-router-dom";
+import { useEffect } from "react";
+
+const NotFound = () => {
+  const location = useLocation();
+
+  useEffect(() => {
+    console.error("404 Error: User attempted to access non-existent route:", location.pathname);
+  }, [location.pathname]);
+
+  return (
+    <div className="flex min-h-screen items-center justify-center bg-muted">
+      <div className="text-center">
+        <h1 className="mb-4 text-4xl font-bold">404</h1>
+        <p className="mb-4 text-xl text-muted-foreground">Oops! Page not found</p>
+        <a href="/" className="text-primary underline hover:text-primary/90">
+          Return to Home
+        </a>
+      </div>
+    </div>
+  );
+};
+
+export default NotFound;