refactor: AI session managed server-side, sessionId returned from API

editor/components/AIPanel.vue

@@ -31,12 +31,12 @@ async function send() {
     return
   }
 
-  store.ensureAISession()
   messages.value.push({ role: 'user', content: msg })
   loading.value = true
 
   try {
-    const { result } = await sendAIRequest(store.aiSessionId, msg, mode.value, store.deepseekKey)
+    const { result, sessionId: newSid } = await sendAIRequest(msg, mode.value, store.deepseekKey, store.aiSessionId || undefined)
+    if (newSid) store.setAISessionId(newSid)
     messages.value.push({ role: 'assistant', content: mode.value === 'json' ? '已生成 JSON，请查看编辑器面板' : '代码已修改，请查看预览窗口' })
 
     if (mode.value === 'json') {
@@ -58,7 +58,7 @@ function onKeydown(e: KeyboardEvent) {
 }
 
 function newSession() {
-  store.newAISession()
+  store.clearAISession()
   messages.value = []
   errorMsg.value = ''
 }

editor/composables/useAI.ts

@@ -1,8 +1,8 @@
-export async function sendAIRequest(sessionId: string, userMessage: string, mode: string, apiKey: string): Promise<{ result: string }> {
+export async function sendAIRequest(userMessage: string, mode: string, apiKey: string, sessionId?: string): Promise<{ result: string; sessionId: string }> {
   const resp = await fetch('/api/ai', {
     method: 'POST',
     headers: { 'Content-Type': 'application/json' },
-    body: JSON.stringify({ sessionId, userMessage, apiKey, mode }),
+    body: JSON.stringify({ userMessage, apiKey, mode, ...(sessionId ? { sessionId } : {}) }),
   })
   if (!resp.ok) {
     const err = await resp.json().catch(() => ({ error: 'request failed' }))

editor/stores/editorStore.ts

@@ -11,7 +11,7 @@ export const useEditorStore = defineStore('editor', () => {
   const deepseekKey = ref(localStorage.getItem('deepseek_key') || '')
   const showAIPanel = ref(false)
   const aiResult = ref('')
-  const aiSessionId = ref(localStorage.getItem('editor_ai_session') || '')
+  const aiSessionId = ref('')
 
   const selectedScene = computed(() => {
     if (!selectedNodeId.value) return null
@@ -138,17 +138,9 @@ export const useEditorStore = defineStore('editor', () => {
 
   function setDeepseekKey(k: string) { deepseekKey.value = k; localStorage.setItem('deepseek_key', k) }
 
-  function ensureAISession() {
-    if (!aiSessionId.value) {
-      aiSessionId.value = crypto.randomUUID()
-      localStorage.setItem('editor_ai_session', aiSessionId.value)
-    }
-  }
+  function setAISessionId(id: string) { aiSessionId.value = id; localStorage.setItem('editor_ai_session', id) }
 
-  function newAISession() {
-    aiSessionId.value = crypto.randomUUID()
-    localStorage.setItem('editor_ai_session', aiSessionId.value)
-  }
+  function clearAISession() { aiSessionId.value = ''; localStorage.removeItem('editor_ai_session') }
 
   function setAIResult(r: string) { aiResult.value = r }
 
@@ -167,6 +159,6 @@ export const useEditorStore = defineStore('editor', () => {
     deepseekKey, showAIPanel, aiResult, aiSessionId,
     markDirty, loadJSON, exportJSON, addScene, deleteScene,
     updateScene, addChoice, updateChoice, deleteChoice, generateId,
-    setSourcePath, setDeepseekKey, ensureAISession, newAISession, setAIResult, autoSave,
+    setSourcePath, setDeepseekKey, setAISessionId, clearAISession, setAIResult, autoSave,
   }
 })