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)

components/AISummary.js

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+import styles from './AISummary.module.css'
+import { useEffect, useState } from 'react'
+
+const AISummary = ({ aiSummary }) => {
+  const [summary, setSummary] = useState('生成中...')
+
+  useEffect(() => {
+    showAiSummaryAnimation(aiSummary, setSummary)
+  }, [])
+
+  return (
+    <div className={styles['post-ai']}>
+      <div className={styles['ai-container']}>
+        <div className={styles['ai-header']}>
+          <div className={styles['ai-icon']}>
+            <svg
+              xmlns='http://www.w3.org/2000/svg'
+              viewBox='0 0 24 24'
+              width='24'
+              height='24'>
+              <path
+                fill='#ffffff'
+                d='M12,2A10,10 0 0,1 22,12A10,10 0 0,1 12,22A10,10 0 0,1 2,12A10,10 0 0,1 12,2M12,4A8,8 0 0,0 4,12A8,8 0 0,0 12,20A8,8 0 0,0 20,12A8,8 0 0,0 12,4M12,6A6,6 0 0,1 18,12A6,6 0 0,1 12,18A6,6 0 0,1 6,12A6,6 0 0,1 12,6M12,8A4,4 0 0,0 8,12A4,4 0 0,0 12,16A4,4 0 0,0 16,12A4,4 0 0,0 12,8Z'
+              />
+            </svg>
+          </div>
+          <div className={styles['ai-title']}>AI智能摘要</div>
+          <div className={styles['ai-tag']}>GPT</div>
+        </div>
+        <div className={styles['ai-content']}>
+          <div className={styles['ai-explanation']}>
+            {summary}
+            {summary !== aiSummary && (
+              <span className={styles['blinking-cursor']}></span>
+            )}
+          </div>
+        </div>
+      </div>
+    </div>
+  )
+}
+
+const showAiSummaryAnimation = (rawSummary, setSummary) => {
+  if (!rawSummary) return
+  let currentIndex = 0
+  const typingDelay = 20
+  const punctuationDelayMultiplier = 6
+  let animationRunning = true
+  let lastUpdateTime = performance.now()
+  const animate = () => {
+    if (currentIndex < rawSummary.length && animationRunning) {
+      const currentTime = performance.now()
+      const timeDiff = currentTime - lastUpdateTime
+
+      const letter = rawSummary.slice(currentIndex, currentIndex + 1)
+      const isPunctuation = /[，。！、？,.!?]/.test(letter)
+      const delay = isPunctuation
+        ? typingDelay * punctuationDelayMultiplier
+        : typingDelay
+
+      if (timeDiff >= delay) {
+        setSummary(rawSummary.slice(0, currentIndex + 1))
+        lastUpdateTime = currentTime
+        currentIndex++
+
+        if (currentIndex < rawSummary.length) {
+          setSummary(rawSummary.slice(0, currentIndex))
+        } else {
+          setSummary(rawSummary)
+          observer.disconnect()
+        }
+      }
+      requestAnimationFrame(animate)
+    }
+  }
+  animate(rawSummary)
+  const observer = new IntersectionObserver(
+    entries => {
+      animationRunning = entries[0].isIntersecting
+      if (animationRunning && currentIndex === 0) {
+        setTimeout(() => {
+          requestAnimationFrame(animate)
+        }, 200)
+      }
+    },
+    { threshold: 0 }
+  )
+  let post_ai = document.querySelector('.post-ai')
+  if (post_ai) {
+    observer.observe(post_ai)
+  }
+}
+
+export default AISummary

components/AISummary.module.css

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+.post-ai {
+    font-family: 'Noto Sans SC', sans-serif;
+    margin-bottom: 20px;
+}
+.ai-container {
+    background: linear-gradient(135deg, #f9f9f9 0%, #f5f5f5 100%);
+    border: 1px solid #e8e8e8;
+    border-radius: 10px;
+    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
+    overflow: hidden;
+}
+.ai-header {
+    background: linear-gradient(135deg, #e74c3c 0%, #c0392b 100%);
+    color: white;
+    padding: 12px 20px;
+    display: flex;
+    align-items: center;
+}
+.ai-icon {
+    margin-right: 10px;
+}
+.ai-title {
+    font-size: 18px;
+    font-weight: bold;
+    flex-grow: 1;
+}
+.ai-tag {
+    background-color: rgba(255, 255, 255, 0.2);
+    padding: 3px 8px;
+    border-radius: 12px;
+    font-size: 12px;
+}
+.ai-content {
+    padding: 20px;
+}
+.ai-explanation {
+    font-size: 16px;
+    line-height: 1.6;
+    color: #333;
+}
+.blinking-cursor {
+    display: inline-block;
+    width: 2px;
+    height: 20px;
+    background-color: #333;
+    animation: blink 0.7s infinite;
+    margin-left: 5px;
+}
+@keyframes blink {
+    0% { opacity: 0; }
+    50% { opacity: 1; }
+    100% { opacity: 0; }
+}