feat: add Qwen (DashScope) support as default provider

- 添加 Qwen flash/plus/max 三个等级模型
- 设置 Qwen 为默认路由策略
- 配置 DashScope API 接口
- 更新 .env.example 包含 Qwen API Key

.env.example

@@ -1,3 +1,6 @@
+# DashScope API Key (阿里云 Qwen)
+DASHSCOPE_API_KEY=sk-37e148fafdfb425f8cc1cfa4efcbc9e1
+
 # OpenAI API Key
 OPENAI_API_KEY=sk-your-openai-key-here
 

config.py

@@ -11,6 +11,10 @@ load_dotenv()
 # 统一模型配置（支持多提供商）
 # 格式: "统一模型名": {"provider": "litellm格式", "input_cost": x, "output_cost": y}
 MODEL_CONFIG = {
+    # Qwen (阿里云)
+    "qwen-flash": {"provider": "openai/qwen-turbo", "input_cost": 0.0003, "output_cost": 0.0006},
+    "qwen-plus": {"provider": "openai/qwen-plus", "input_cost": 0.0008, "output_cost": 0.002},
+    "qwen-max": {"provider": "openai/qwen-max", "input_cost": 0.002, "output_cost": 0.006},
     # OpenAI
     "gpt-3.5": {"provider": "gpt-3.5-turbo", "input_cost": 0.0005, "output_cost": 0.0015},
     "gpt-4o-mini": {"provider": "gpt-4o-mini", "input_cost": 0.00015, "output_cost": 0.0006},
@@ -32,14 +36,17 @@ ROUTING_THRESHOLDS = {
     "medium": 500,   # < 500 tokens
 }
 
-# 默认模型选择策略
+# 默认模型选择策略（使用 Qwen 作为默认）
 DEFAULT_ROUTING = {
-    "simple": "gpt-3.5",      # 或 "claude-3-haiku", "gemini-flash"
+    "simple": "qwen-flash",   # 轻量级任务
-    "medium": "gpt-4o-mini",  # 或 "claude-3-haiku"
+    "medium": "qwen-plus",    # 中等任务
-    "complex": "gpt-4o",      # 或 "claude-3-sonnet", "gemini-pro"
+    "complex": "qwen-max",    # 复杂任务
 }
 
 # API Keys（litellm 自动读取环境变量）
+# Qwen (阿里云)
+DASHSCOPE_API_KEY = os.getenv("DASHSCOPE_API_KEY", "")
+# OpenAI
 OPENAI_API_KEY = os.getenv("OPENAI_API_KEY", "")
 ANTHROPIC_API_KEY = os.getenv("ANTHROPIC_API_KEY", "")
 GEMINI_API_KEY = os.getenv("GEMINI_API_KEY", "")

main.py

@@ -10,8 +10,15 @@ from typing import List, Dict, Any, Optional
 from fastapi import FastAPI, HTTPException
 from pydantic import BaseModel
 from litellm import acompletion
+import litellm
 
-from config import MODEL_CONFIG, ROUTING_THRESHOLDS, DEFAULT_ROUTING
+from config import MODEL_CONFIG, ROUTING_THRESHOLDS, DEFAULT_ROUTING, DASHSCOPE_API_KEY
+
+# 配置 LiteLLM 使用 DashScope (Qwen)
+if DASHSCOPE_API_KEY:
+    litellm.api_key = DASHSCOPE_API_KEY
+    # Qwen 使用 OpenAI 兼容接口，但需要通过 api_base 指定
+    litellm.api_base = "https://dashscope.aliyuncs.com/compatible-mode/v1"
 
 
 # 调用历史记录