Fix encoding issue: replace special character in logger message

src/llm_router.py

@@ -51,7 +51,7 @@ class LLMRouter:
                 base_url=self.settings.novita_base_url,
                 api_key=self.settings.novita_api_key,
             )
-            logger.info(f"✓ Novita AI API client initialized")
+            logger.info("Novita AI API client initialized")
             logger.info(f"  Base URL: {self.settings.novita_base_url}")
             logger.info(f"  Model: {self.settings.novita_model}")
         except Exception as e: