Enhance voice configuration with idle prompt features and new TTS settings

- Added idle prompt timeout, maximum count, and text to multiple voice configuration files to improve user interaction during idle periods.
- Updated greeting mode to 'fastgpt_opener' in relevant configurations for a more dynamic greeting experience.
- Introduced a new voice configuration file for xfyun TTS, including detailed service settings and parameters.
- Refactored the pipeline to handle idle prompts and user turn events, ensuring smoother interaction flow.
- Adjusted the VAD and turn configurations to accommodate new idle prompt features.

config/voice-fastgpt-state-xfyunSuperTTS.json

@@ -42,12 +42,15 @@
       "你好",
       "在吗"
     ],
-    "user_speech_timeout_sec": 0.2
+    "user_speech_timeout_sec": 0.2,
+    "idle_prompt_timeout_sec": 3.0,
+    "idle_prompt_max_count": 3,
+    "idle_prompt_text": "你好，请问还在吗？"
   },
   "agent": {
     "system_prompt": "FastGPT app owns the system prompt when send_system_prompt is false.",
     "greeting": "您好，这里是无锡交警，我将为您远程处理交通事故。请将人员撤离至路侧安全区域，开启危险报警双闪灯、放置三角警告牌、做好安全防护，谨防二次事故伤害。若您已经准备好了，请点击继续办理，如需人工服务，请说转人工。",
-    "greeting_mode": "fixed",
+    "greeting_mode": "fastgpt_opener",
     "response_state": {
       "enabled": true,
       "tag": "state",