feat: Add LangGraph streaming with real-time UI updates

- Add streaming schemas and events
- Implement run_review_stream in ReviewerAgent
- Update task_worker to broadcast streaming events via WebSocket
- Create ReviewStream component for real-time progress visualization
- Integrate ReviewStream into ReviewDetail page
- Show agent steps, LLM messages, and progress in real-time

frontend/src/pages/ReviewDetail.tsx

@@ -5,6 +5,7 @@ import { getReview, retryReview } from '../api/client';
 import { wsClient } from '../api/websocket';
 import ReviewProgress from '../components/ReviewProgress';
 import CommentsList from '../components/CommentsList';
+import { ReviewStream } from '../components/ReviewStream';
 import { formatDistance } from 'date-fns';
 import { ru } from 'date-fns/locale';
 
@@ -127,6 +128,11 @@ export default function ReviewDetail() {
         </div>
       </div>
 
+      {/* Real-time Review Stream (only during review) */}
+      {['pending', 'fetching', 'analyzing', 'commenting'].includes(review.status) && (
+        <ReviewStream reviewId={review.id} />
+      )}
+
       {/* Progress */}
       <div className="bg-gray-800 rounded-lg p-6 border border-gray-700">
         <h2 className="text-xl font-semibold text-white mb-4">Прогресс</h2>