🎉 feat: initialize 宇之然AI维度 project

- uni-app Vue3 frontend with dark glassmorphism theme
- 5 AI dimensions: Origin / Development / Current / Learning / Trend
- AI Chat system prompt updated from geometry to AI
- 23 AI knowledge articles initialized in DB
- Trend API + cron job for daily news
- Product pricing (Pro ¥19.9, VIP ¥39.9)
- Pinia stores + API utilities
- AGENTS.md documentation

backend/wdkj-server/scripts/fix-bgm-urls.js

@@ -0,0 +1,36 @@
+/**
+ * 快速修复BGM URL - 使用测试音频
+ */
+
+const mongoose = require('mongoose')
+require('dotenv').config()
+
+const { BGM } = require('../src/models')
+
+// 免费的测试音频URL (SoundHelix - 可商用)
+const TEST_AUDIO_URL = 'https://www.soundhelix.com/examples/mp3/SoundHelix-Song-1.mp3'
+
+async function fixBGMUrls() {
+  try {
+    await mongoose.connect(process.env.MONGODB_URI || 'mongodb://localhost:27017/yuzhiran')
+    console.log('✅ 数据库连接成功')
+    
+    // 更新所有BGM的URL为测试音频
+    const result = await BGM.updateMany(
+      {},
+      { url: TEST_AUDIO_URL }
+    )
+    
+    console.log(`✅ 已更新 ${result.modifiedCount} 条BGM记录`)
+    console.log(`   新URL: ${TEST_AUDIO_URL}`)
+    console.log('\n💡 现在可以测试BGM播放功能了')
+    console.log('⚠️  注意: 这是测试音频,生产环境请替换为正式音乐')
+    
+  } catch (error) {
+    console.error('❌ 更新失败:', error)
+  } finally {
+    await mongoose.disconnect()
+  }
+}
+
+fixBGMUrls()