chore: import upstream snapshot with attribution

components/esp_stdio/linux/include/esp_stdio_linux.h

@@ -0,0 +1,51 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#pragma once
+
+#include "esp_err.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Configuration for a Linux host-side console port.
+ *
+ * Represents the configuration used when running the console interface on a
+ * Linux host environment. This is typically used in host-based testing,
+ * emulation, or development workflows where the console backend is not a
+ * hardware UART or USB device.
+ */
+typedef struct linux_port_config {
+
+} linux_port_config_t;
+
+/**
+ * @brief Install the Linux console driver.
+ *
+ * Sets up the Linux console port as the active input/output backend for console
+ * operations. After installation, standard I/O (such as printf or terminal input)
+ * will pass through this Linux-based interface.
+ *
+ * @param config Pointer to the Linux console port configuration.
+ * @return ESP_OK if the driver was successfully installed, or an error otherwise.
+ */
+esp_err_t linux_vfs_dev_port_init(linux_port_config_t *config);
+
+/**
+ * @brief Uninstall the Linux console driver.
+ *
+ * Releases resources allocated during driver installation and restores state
+ * associated with the Linux console backend. Call this when shutting down or
+ * switching to another console interface.
+ *
+ * @param config Pointer to the Linux console port configuration.
+ */
+void linux_vfs_dev_port_deinit(linux_port_config_t *config);
+
+#ifdef __cplusplus
+}
+#endif