fix(moonshot): resolve 401 Unauthorized errors by trimming API keys and improving request compatibility

internal/config/config.go

@@ -203,5 +203,5 @@ func (c *Config) GetAPIKey(provider string) (string, error) {
 	if val == "" {
 		return "", fmt.Errorf("environment variable %s not set for %s", envVar, provider)
 	}
-	return val, nil
+	return strings.TrimSpace(val), nil
 }