chore(speaking): 删除 useDialogueEngine 的死 import SessionConfig

不再有代码引用此类型。

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/views/Editor/EnglishSpeaking/composables/useDialogueEngine.ts

@@ -1,5 +1,5 @@
 import { ref, reactive, computed, onUnmounted } from 'vue'
-import type { PreviewChatMessage, DialogueAPI, SessionConfig, DialogueReport } from '@/types/englishSpeaking'
+import type { PreviewChatMessage, DialogueAPI, DialogueReport } from '@/types/englishSpeaking'
 import { createDialogueApi, DialogueApiError } from '../services/llmService'
 
 export function useDialogueEngine(mode: 'preview' | 'real' = 'preview') {