修复重构后的导入错误和缺失模块

backend/app/subgraphs/dictionary/__init__.py

@@ -3,13 +3,13 @@
 Dictionary Subgraph Module - Complete
 """
 
-from .state import (
+from app.main_graph.state import (
     DictionaryState,
     DictionaryAction,
     WordEntry,
     ExtractedTerm
 )
-from .graph import build_dictionary_subgraph
+from app.main_graph.graph import build_dictionary_subgraph
 from .nodes import (
     parse_intent,
     query_word,

backend/app/subgraphs/dictionary/graph.py

@@ -5,7 +5,7 @@ Dictionary Subgraph Builder - Complete
 
 from app.main_graph.graph import StateGraph, START, END
 
-from .state import DictionaryState
+from app.main_graph.state import DictionaryState
 from .nodes import (
     parse_intent,
     query_word,

backend/app/subgraphs/dictionary/nodes.py

@@ -12,7 +12,7 @@ from ..common import (
     MarkdownFormatter
 )
 
-from .state import (
+from app.main_graph.state import (
     DictionaryState,
     DictionaryAction,
     WordEntry,