feat(原生支持AI摘要功能): 使用一层API作为缓存而非直接请求AI，可以实现缓存/后端保密和预渲染

(cherry picked from commit 611a7d1d5dc7bc200d4390e29217ab8c8f76b0f0)

lib/plugins/aiSummary.js

@@ -0,0 +1,31 @@
+/**
+ * get Ai summary
+ * @returns {Promise<string>}
+ * @param aiSummaryAPI
+ * @param aiSummaryKey
+ * @param truncatedText
+ */
+export async function getAiSummary(aiSummaryAPI, aiSummaryKey, truncatedText) {
+  try {
+    const response = await fetch(aiSummaryAPI, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json'
+      },
+      body: JSON.stringify({
+        token: aiSummaryKey,
+        content: truncatedText
+      })
+    })
+
+    if (response.ok) {
+      const data = await response.json()
+      return data.summary
+    } else {
+      throw new Error('Response not ok')
+    }
+  } catch (error) {
+    console.error('ChucklePostAI：请求失败', error)
+    return '获取文章摘要失败，请稍后再试。'
+  }
+}