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/pages/teacher/TeacherAssignments.tsx

@@ -0,0 +1,83 @@
+import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
+import { Badge } from "@/components/ui/badge";
+import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
+import { Button } from "@/components/ui/button";
+import { useAssignments } from "@/hooks/queries";
+import { Link } from "react-router-dom";
+import AiCreationAssistant from "@/components/ai/AiCreationAssistant";
+import AiGeneratorModal from "@/components/ai/AiGeneratorModal";
+import AiTipBanner from "@/components/ai/AiTipBanner";
+
+export default function TeacherAssignments() {
+  const { data: assignmentsData, isLoading } = useAssignments();
+  const assignments = assignmentsData?.items ?? [];
+  const submissions: unknown[] = [];
+  if (isLoading) return <div className="flex items-center justify-center min-h-[400px]"><div className="animate-spin rounded-full h-8 w-8 border-b-2 border-primary" /></div>;
+
+  const teacherAssignments = assignments;
+  const pendingSubs = (submissions as { id: string; studentName: string; submittedAt: string; status: string; feedback?: string; grade?: number }[]).filter(s => s.status === "pending");
+  const gradedSubs = (submissions as { id: string; studentName: string; submittedAt: string; status: string; feedback?: string; grade?: number }[]).filter(s => s.status === "graded");
+
+  return (
+    <div className="space-y-6">
+      <div className="flex items-center justify-between">
+        <div>
+          <h1 className="text-2xl font-bold">Assignments</h1>
+          <p className="text-muted-foreground">Manage and grade student assignments.</p>
+        </div>
+        <div className="flex gap-2">
+          <AiCreationAssistant type="assignment" />
+          <AiGeneratorModal />
+        </div>
+      </div>
+
+      <AiTipBanner context="teacher-assignments" variant="insight" />
+
+      <Tabs defaultValue="all">
+        <TabsList>
+          <TabsTrigger value="all">All ({teacherAssignments.length})</TabsTrigger>
+          <TabsTrigger value="pending">Pending Review ({pendingSubs.length})</TabsTrigger>
+          <TabsTrigger value="graded">Graded ({gradedSubs.length})</TabsTrigger>
+        </TabsList>
+
+        <TabsContent value="all" className="mt-4 space-y-3">
+          {teacherAssignments.map(a => (
+            <Link to={`/teacher/assignments/${a.id}`} key={a.id}>
+              <Card className="hover:bg-muted/30 transition-colors">
+                <CardContent className="pt-4 flex items-center justify-between">
+                  <div><p className="font-medium text-sm">{a.title}</p><p className="text-xs text-muted-foreground">{a.entity_name} · Due: {a.end_date}</p></div>
+                  <div className="flex items-center gap-2">
+                    <Badge variant="outline" className="capitalize text-xs">{a.state}</Badge>
+                    <Badge variant={a.completed_count >= a.assignee_count && a.assignee_count > 0 ? "default" : "secondary"} className="capitalize">{a.state}</Badge>
+                  </div>
+                </CardContent>
+              </Card>
+            </Link>
+          ))}
+        </TabsContent>
+
+        <TabsContent value="pending" className="mt-4 space-y-3">
+          {pendingSubs.map(s => (
+            <Card key={s.id}>
+              <CardContent className="pt-4 flex items-center justify-between">
+                <div><p className="font-medium text-sm">{s.studentName}</p><p className="text-xs text-muted-foreground">Submitted: {s.submittedAt}</p></div>
+                <Badge variant="secondary">Pending</Badge>
+              </CardContent>
+            </Card>
+          ))}
+        </TabsContent>
+
+        <TabsContent value="graded" className="mt-4 space-y-3">
+          {gradedSubs.map(s => (
+            <Card key={s.id}>
+              <CardContent className="pt-4 flex items-center justify-between">
+                <div><p className="font-medium text-sm">{s.studentName}</p><p className="text-xs text-muted-foreground">{s.feedback}</p></div>
+                <span className="font-bold text-primary">{s.grade}</span>
+              </CardContent>
+            </Card>
+          ))}
+        </TabsContent>
+      </Tabs>
+    </div>
+  );
+}