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/package.json

@@ -0,0 +1,24 @@
+{
+  "name": "eai_agentplatform-app",
+  "version": "1.1.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "node ./node_modules/vite/bin/vite.js",
+    "build": "node ./node_modules/vite/bin/vite.js build",
+    "preview": "node ./node_modules/vite/bin/vite.js preview"
+  },
+  "dependencies": {
+    "vue": "^3.4.0",
+    "vue-router": "^4.3.0",
+    "pinia": "^2.1.0",
+    "axios": "^1.6.0",
+    "element-plus": "^2.5.0",
+    "@element-plus/icons-vue": "^2.3.0",
+    "@vue-flow/core": "^1.44.0"
+  },
+  "devDependencies": {
+    "@vitejs/plugin-vue": "^5.0.0",
+    "vite": "^5.0.0"
+  }
+}