feat: 完成TCP2UART透传核心集成

集成CH390驱动、LwIP协议栈和FreeRTOS多任务透传框架，确保TCP Server/Client与UART链路按配置稳定联动。

App/flash_param.h

@@ -0,0 +1,75 @@
+/**
+ * @file flash_param.h
+ * @brief Flash parameter storage module for TCP2UART
+ * 
+ * Stores configuration parameters in STM32F103 internal Flash.
+ * Uses the last page of Flash (1KB) for parameter storage.
+ */
+
+#ifndef __FLASH_PARAM_H__
+#define __FLASH_PARAM_H__
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Flash configuration for STM32F103R8 (64KB Flash) */
+#define FLASH_PARAM_PAGE_SIZE       1024        /* 1KB per page for STM32F103 */
+#define FLASH_PARAM_START_ADDR      0x0800FC00  /* Last 1KB of 64KB Flash */
+#define FLASH_PARAM_END_ADDR        0x08010000  /* End of Flash */
+
+/* For STM32F103RC (256KB), use: 0x0803FC00 */
+/* For STM32F103RB (128KB), use: 0x0801FC00 */
+
+/**
+ * @brief Initialize Flash parameter storage
+ * @return 0 on success, negative on error
+ */
+int flash_param_init(void);
+
+/**
+ * @brief Read parameters from Flash
+ * @param data Output buffer
+ * @param len Length to read
+ * @return 0 on success, negative on error
+ */
+int flash_param_read(void *data, uint32_t len);
+
+/**
+ * @brief Write parameters to Flash
+ * @param data Data to write
+ * @param len Length to write
+ * @return 0 on success, negative on error
+ * 
+ * Note: This function will erase the Flash page before writing.
+ */
+int flash_param_write(const void *data, uint32_t len);
+
+/**
+ * @brief Erase parameter storage area
+ * @return 0 on success, negative on error
+ */
+int flash_param_erase(void);
+
+/**
+ * @brief Calculate CRC32 for data
+ * @param data Data buffer
+ * @param len Data length
+ * @return CRC32 value
+ */
+uint32_t flash_param_crc32(const void *data, uint32_t len);
+
+/**
+ * @brief Verify parameter storage integrity
+ * @return 0 if valid, negative if invalid or corrupted
+ */
+int flash_param_verify(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __FLASH_PARAM_H__ */