feat: 完善子图，添加路由函数和审核节点

backend/app/agent_subgraphs/dictionary/nodes.py

@@ -250,5 +250,28 @@ def format_result(state: DictionaryState) -> DictionaryState:
     state.final_result = "\n".join(output_lines)
     state.success = True
     state.current_phase = "completed"
+
+    return state
+
+
+def should_continue(state: DictionaryState) -> str:
+    """
+    条件路由函数：根据 action 决定下一个节点
+    """
+    action = state.action
+    if action == DictionaryAction.QUERY:
+        return "query_word"
+    elif action == DictionaryAction.TRANSLATE:
+        return "translate_text"
+    elif action == DictionaryAction.EXTRACT:
+        return "extract_terms"
+    elif action == DictionaryAction.DAILY_WORD:
+        return "get_daily_word"
+    elif action == DictionaryAction.LOOKUP_WORD_BOOK:
+        return "lookup_word_book"
+    elif action == DictionaryAction.ADD_TO_WORD_BOOK:
+        return "add_to_word_book"
+    else:
+        return "format_result"
     
     return state