Add chat_id, variables, detail, timeout_sec, and send_system_prompt to LLMConfig; update create_llm_service to accept new parameters and handle FastGPT integration. Modify pipeline to utilize chat_id and adjust message handling based on provider settings.

config/fastgpt.example.json

@@ -0,0 +1,49 @@
+{
+  "server": {
+    "host": "0.0.0.0",
+    "port": 8000,
+    "cors_origins": ["*"]
+  },
+  "audio": {
+    "sample_rate_hz": 16000,
+    "channels": 1,
+    "frame_ms": 20
+  },
+  "session": {
+    "inactivity_timeout_sec": 60
+  },
+  "agent": {
+    "system_prompt": "FastGPT app owns the system prompt when send_system_prompt is false.",
+    "greeting": "你好",
+    "greeting_mode": "generated"
+  },
+  "services": {
+    "stt": {
+      "provider": "openai",
+      "api_key": "YOUR_STT_KEY",
+      "base_url": "https://api.openai.com/v1",
+      "model": "gpt-4o-mini-transcribe",
+      "language": "zh"
+    },
+    "llm": {
+      "provider": "fastgpt",
+      "api_key": "fastgpt-xxxxx",
+      "base_url": "http://localhost:3000",
+      "model": "my-voice-app",
+      "chat_id": null,
+      "variables": {
+        "user_name": "访客"
+      },
+      "detail": false,
+      "timeout_sec": 60.0,
+      "send_system_prompt": false
+    },
+    "tts": {
+      "provider": "openai",
+      "api_key": "YOUR_TTS_KEY",
+      "base_url": "https://api.openai.com/v1",
+      "model": "gpt-4o-mini-tts",
+      "voice": "alloy"
+    }
+  }
+}