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

backend/app/workers/task_worker.py

@@ -159,14 +159,45 @@ class ReviewTaskWorker:
             await db.commit()
             await db.refresh(review)
         
-        # Run review agent
+        # Run review agent with streaming
         logger.info(f"   🤖 Запуск AI review для PR #{pull_request.pr_number}")
         
+        # Import broadcast function
+        from app.main import manager
+        from datetime import datetime as dt
+        
+        # Create event handler
+        async def on_review_event(event: dict):
+            """Handle review events and broadcast to clients"""
+            try:
+                # Prepare event data
+                event_data = {
+                    "type": event.get("type", "agent_update"),
+                    "review_id": review.id,
+                    "pr_number": pull_request.pr_number,
+                    "timestamp": dt.utcnow().isoformat(),
+                    "data": event
+                }
+                
+                # Broadcast to all connected clients
+                await manager.broadcast(event_data)
+                
+                # Log the event
+                if event.get("type") == "agent_step":
+                    step = event.get("step", "unknown")
+                    logger.info(f"      📍 Step: {step}")
+                elif event.get("type") == "llm_message":
+                    message = event.get("message", "")[:100]
+                    logger.debug(f"      💬 LLM: {message}...")
+            except Exception as e:
+                logger.error(f"   ❌ Ошибка broadcast события: {e}")
+        
         agent = ReviewerAgent(db)
-        await agent.run_review(
+        await agent.run_review_stream(
             review_id=review.id,
             pr_number=pull_request.pr_number,
-            repository_id=repository.id
+            repository_id=repository.id,
+            on_event=on_review_event
         )
         
         logger.info(f"   ✅ Review завершен для PR #{pull_request.pr_number}")