Refactor STT architecture

config.example.yaml

@@ -5,7 +5,6 @@ server:
 
 stt:
   url: "http://localhost:8178"
-  timeout: "30s"
 
 llm:
   url: "http://localhost:8081/v1"
@@ -17,16 +16,6 @@ llm:
 tts:
   url: "http://localhost:8880"
   voice: "af_heart"
-  voice_map:
-    english: "af_heart"       # American English
-    chinese: "zf_xiaobei"     # Mandarin Chinese
-    japanese: "jf_alpha"      # Japanese
-    spanish: "ef_dora"        # Spanish
-    french: "ff_siwis"        # French
-    hindi: "hf_alpha"         # Hindi
-    italian: "if_sara"        # Italian
-    portuguese: "pf_dora"     # Brazilian Portuguese
-    korean: "kf_sarah"        # Korean
   timeout: "60s"
 
 tools: