add debug info

sentence_api/config.py

@@ -26,6 +26,7 @@ class Settings:
     moss_timeout_seconds: float
     moss_max_new_tokens: int
     moss_end_padding_ms: int
+    log_level: str
     ai_api_url: str
     ai_api_key: str
     ai_model: str
@@ -65,6 +66,7 @@ class Settings:
             moss_timeout_seconds=float(os.getenv("MOSS_TIMEOUT_SECONDS", "1800")),
             moss_max_new_tokens=int(os.getenv("MOSS_MAX_NEW_TOKENS", "65536")),
             moss_end_padding_ms=int(os.getenv("MOSS_END_PADDING_MS", "300")),
+            log_level=os.getenv("LOG_LEVEL", "INFO").strip().upper() or "INFO",
             ai_api_url=os.getenv("AI_API_URL", "").strip().rstrip("/"),
             ai_api_key=os.getenv("AI_API_KEY", "").strip(),
             ai_model=os.getenv("AI_MODEL", "gpt-4o-mini"),