Add fastgpt as seperate assistant mode

engine/config/agents/volcengine_ontest.yaml

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+# Agent behavior configuration (safe to edit per profile)
+# This file only controls agent-side behavior (VAD/LLM/TTS/ASR providers).
+# Infra/server/network settings should stay in .env.
+
+agent:
+  vad:
+    type: silero
+    model_path: data/vad/silero_vad.onnx
+    threshold: 0.5
+    min_speech_duration_ms: 100
+    eou_threshold_ms: 800
+
+  llm:
+    # provider: openai | openai_compatible | siliconflow
+    provider: openai_compatible
+    model: deepseek-v3
+    temperature: 0.7
+    # Required: no fallback. You can still reference env explicitly.
+    api_key: sk-fc4d59b360475f53401a864db8ce0985010acc4e696723d20a90d6569f38d80a
+    # Optional for OpenAI-compatible endpoints:
+    api_url: https://api.qnaigc.com/v1
+
+  tts:
+    # provider: edge | openai_compatible | siliconflow | dashscope
+    # dashscope defaults (if omitted):
+    #   api_url: wss://dashscope.aliyuncs.com/api-ws/v1/realtime
+    #   model: qwen3-tts-flash-realtime
+    #   dashscope_mode: commit (engine splits) | server_commit (dashscope splits)
+    #   note: dashscope_mode/mode is ONLY used when provider=dashscope.
+    # volcengine defaults (if omitted):
+    provider: volcengine
+    api_url: https://openspeech.bytedance.com/api/v3/tts/unidirectional
+    resource_id: seed-tts-2.0
+    app_id: 2931820332
+    api_key: 4ustCTIpdCq8dE_msFrZvFn4nDpioIVo
+    speed: 1.1
+    voice: zh_female_vv_uranus_bigtts
+
+  asr:
+    provider: volcengine
+    api_url: wss://openspeech.bytedance.com/api/v3/sauc/bigmodel
+    app_id: 8607675070
+    api_key: QiO0AptfmU0GLTSitwn7t5-zeo4gJ6K1
+    resource_id: volc.bigasr.sauc.duration
+    uid: caller-1
+    model: bigmodel
+    request_params:
+      end_window_size: 800
+      force_to_speech_time: 1000
+      enable_punc: true
+      enable_itn: false
+      enable_ddc: false
+      show_utterance: true
+      result_type: single
+    interim_interval_ms: 500
+    min_audio_ms: 300
+    start_min_speech_ms: 160
+    pre_speech_ms: 240
+    final_tail_ms: 120
+
+  duplex:
+    enabled: true
+    system_prompt: 你是一个人工智能助手，你用简答语句回答，避免使用标点符号和emoji。
+
+  barge_in:
+    min_duration_ms: 200
+    silence_tolerance_ms: 60