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/schemas/__init__.py

@@ -16,6 +16,13 @@ from app.schemas.webhook import (
     GitHubWebhook,
     BitbucketWebhook
 )
+from app.schemas.streaming import (
+    StreamEvent,
+    AgentStepEvent,
+    LLMStreamEvent,
+    ReviewProgressEvent,
+    StreamEventType
+)
 
 __all__ = [
     "RepositoryCreate",
@@ -28,5 +35,10 @@ __all__ = [
     "GiteaWebhook",
     "GitHubWebhook",
     "BitbucketWebhook",
+    "StreamEvent",
+    "AgentStepEvent",
+    "LLMStreamEvent",
+    "ReviewProgressEvent",
+    "StreamEventType",
 ]
 

backend/app/schemas/streaming.py

@@ -0,0 +1,55 @@
+"""Streaming events schemas"""
+
+from typing import Optional, Any, Dict, Literal
+from pydantic import BaseModel
+
+
+class StreamEventType:
+    """Stream event types"""
+    AGENT_START = "agent_start"
+    AGENT_UPDATE = "agent_update"
+    AGENT_STEP = "agent_step"
+    LLM_START = "llm_start"
+    LLM_STREAM = "llm_stream"
+    LLM_END = "llm_end"
+    AGENT_ERROR = "agent_error"
+    AGENT_COMPLETE = "agent_complete"
+
+
+class StreamEvent(BaseModel):
+    """Base streaming event"""
+    type: str
+    review_id: int
+    timestamp: str
+    data: Dict[str, Any]
+
+
+class AgentStepEvent(BaseModel):
+    """Agent step event"""
+    type: Literal["agent_step"] = "agent_step"
+    review_id: int
+    step: str  # fetch_pr_info, fetch_files, analyze_files, post_comments
+    status: str  # started, completed, failed
+    message: str
+    data: Optional[Dict[str, Any]] = None
+
+
+class LLMStreamEvent(BaseModel):
+    """LLM streaming event"""
+    type: Literal["llm_stream"] = "llm_stream"
+    review_id: int
+    file_path: Optional[str] = None
+    chunk: str  # Часть ответа от LLM
+    is_complete: bool = False
+
+
+class ReviewProgressEvent(BaseModel):
+    """Review progress event"""
+    type: Literal["review_progress"] = "review_progress"
+    review_id: int
+    total_files: int
+    analyzed_files: int
+    total_comments: int
+    current_step: str
+    message: str
+