修复重构后的导入错误和缺失模块

backend/app/main_graph/nodes/__init__.py

@@ -1 +1,19 @@
-"""主图节点"""
+"""
+主图节点模块导出
+"""
+
+from .router import should_continue
+from .llm_call import create_llm_call_node
+from .tool_call import create_tool_call_node
+from .retrieve_memory import create_retrieve_memory_node
+from .summarize import create_summarize_node
+from .finalize import finalize_node
+
+__all__ = [
+    "should_continue",
+    "create_llm_call_node",
+    "create_tool_call_node",
+    "create_retrieve_memory_node",
+    "create_summarize_node",
+    "finalize_node",
+]

backend/app/main_graph/nodes/finalize.py

@@ -8,8 +8,8 @@ from app.main_graph.config import get_stream_writer
 
 # 本地模块
 from app.main_graph.state import MessagesState
-from ..utils.logging import log_state_change
-from ..logger import info, error
+from app.utils.logging import log_state_change
+from app.logger import info, error
 
 from langchain_core.runnables.config import RunnableConfig
 

backend/app/main_graph/nodes/llm_call.py

@@ -10,9 +10,9 @@ from langchain_core.messages import AIMessage
 
 # 本地模块
 from app.main_graph.state import MessagesState
-from ..agent.prompts import create_system_prompt
-from ..utils.logging import log_state_change
-from ..logger import debug, info, error
+from app.agent.prompts import create_system_prompt
+from app.utils.logging import log_state_change
+from app.logger import debug, info, error
 
 def create_llm_call_node(llm: BaseLLM, tools: list):
     """

backend/app/main_graph/nodes/memory_trigger.py

@@ -1,8 +1,8 @@
 from typing import Any, Dict
 from langchain_core.runnables.config import RunnableConfig
 from app.main_graph.state import MessagesState
-from ..memory.mem0_client import Mem0Client
-from ..logger import info
+from app.memory.mem0_client import Mem0Client
+from app.logger import info
 
 # 全局变量，在 GraphBuilder 中注入
 _mem0_client: Mem0Client = None

backend/app/main_graph/nodes/rag_nodes.py

@@ -11,7 +11,7 @@ import asyncio
 from typing import Dict, Any, Optional
 from datetime import datetime
 
-from .state import MainGraphState, ErrorRecord, ErrorSeverity
+from app.main_graph.state import MainGraphState, ErrorRecord, ErrorSeverity
 from .retry_utils import (
     RetryConfig,
     RAG_RETRY_CONFIG,
@@ -19,8 +19,8 @@ from .retry_utils import (
 )
 
 # 真正导入和利用已有 RAG 代码
-from ..rag.tools import create_rag_tool_sync
-from ..rag.pipeline import RAGPipeline
+from app.rag.tools import create_rag_tool_sync
+from app.rag.pipeline import RAGPipeline
 
 
 # ========== 全局 RAG 工具实例（延迟初始化）==========

backend/app/main_graph/nodes/react_nodes.py

@@ -22,7 +22,7 @@ from app.core.intent import (
     ReasoningResult
 )
 from app.core.state_base import StateUtils
-from .state import MainGraphState, ErrorRecord, ErrorSeverity
+from app.main_graph.state import MainGraphState, ErrorRecord, ErrorSeverity
 from .retry_utils import (
     RetryConfig,
     SUBGRAPH_RETRY_CONFIG

backend/app/main_graph/nodes/retrieve_memory.py

@@ -6,10 +6,10 @@
 from typing import Any, Dict
 
 # 本地模块
-from .state import MessagesState
-from ..memory.mem0_client import Mem0Client
-from ..utils.logging import log_state_change
-from ..logger import debug
+from app.main_graph.state import MessagesState
+from app.memory.mem0_client import Mem0Client
+from app.utils.logging import log_state_change
+from app.logger import debug
 
 def create_retrieve_memory_node(mem0_client: Mem0Client):
     """

backend/app/main_graph/nodes/router.py

@@ -7,9 +7,9 @@ from typing import Literal
 from langchain_core.messages import AIMessage
 
 # 本地模块
-from ..config import ENABLE_GRAPH_TRACE, MEMORY_SUMMARIZE_INTERVAL
+from app.config import ENABLE_GRAPH_TRACE, MEMORY_SUMMARIZE_INTERVAL
 from app.main_graph.state import MessagesState
-from ..logger import info
+from app.logger import info
 
 
 def should_continue(state: MessagesState) -> Literal['tool_node', 'summarize', 'finalize']:

backend/app/main_graph/nodes/summarize.py

@@ -7,9 +7,9 @@ from typing import Any, Dict
 
 # 本地模块
 from app.main_graph.state import MessagesState
-from ..memory.mem0_client import Mem0Client
-from ..utils.logging import log_state_change
-from ..logger import debug, info, error, warning
+from app.memory.mem0_client import Mem0Client
+from app.utils.logging import log_state_change
+from app.logger import debug, info, error, warning
 
 def create_summarize_node(mem0_client: Mem0Client):
     """

backend/app/main_graph/nodes/tool_call.py

@@ -10,8 +10,8 @@ from app.main_graph.config import get_stream_writer
 
 # 本地模块
 from app.main_graph.state import MessagesState
-from ..utils.logging import log_state_change
-from ..logger import debug, info
+from app.utils.logging import log_state_change
+from app.logger import debug, info
 
 def create_tool_call_node(tools_by_name: Dict[str, Any]):
     """