fix: 完善

config.example/config.toml

@@ -26,4 +26,13 @@ min_denominator = 3
 nucleon_dir = "./data/nucleon"
 electron_dir = "./data/electron"
 orbital_dir = "./data/orbital"
-cache_dir = "./data/cache"
+cache_dir = "./data/cache"
+
+[services] # 定义服务到提供者的映射
+audio = "playsound" # 可选项: playsound(通用), termux(仅用于支持 Android Termux), mpg123(TODO)
+tts = "edgetts" # 可选项: edgetts
+llm = "openai" # 可选项: openai
+
+[providers.llm.openai] # 与 OpenAI 相容的语言模型接口服务设置
+url = ""
+key = ""