feat: 新增语音转文字（ASR）功能

- 后端：新增 /api/audio/transcribe 接口，调用 Ollama whisper 进行语音识别
- 前端：新增 AudioTranscribePage.vue 页面，支持 MP3/WAV/M4A/OGG/FLAC 等格式
- 注册路由、工具卡片、智能助手欢迎语更新

Co-Authored-By: Claude Code <noreply@anthropic.com>

eai_agentplatform/frontend/vite.config.js

@@ -0,0 +1,39 @@
+import { defineConfig } from 'vite'
+import vue from '@vitejs/plugin-vue'
+import path from 'path'
+
+export default defineConfig({
+  plugins: [vue()],
+  resolve: {
+    alias: {
+      '@': path.resolve(__dirname, 'src'),
+    },
+  },
+  build: {
+    rollupOptions: {
+      output: {
+        manualChunks(id) {
+          if (!id.includes('node_modules')) return
+          if (id.includes('element-plus') || id.includes('@element-plus')) return 'vendor-element-plus'
+          if (id.includes('vue') || id.includes('pinia') || id.includes('vue-router')) return 'vendor-vue'
+          if (id.includes('axios')) return 'vendor-http'
+          if (id.includes('echarts') || id.includes('zrender')) return 'vendor-charts'
+          return 'vendor-misc'
+        },
+      },
+    },
+  },
+  server: {
+    port: 10231,
+    proxy: {
+      '/api': {
+        target: 'http://127.0.0.1:10232',
+        changeOrigin: true,
+      },
+      '/media': {
+        target: 'http://127.0.0.1:10232',
+        changeOrigin: true,
+      },
+    },
+  },
+})