feat(core): 移除状态监控任务并优化系统资源

移除原有的周期性状态监控任务，减少系统负载和内存占用。

perf(relay): 优化OTA中继挑战响应验证逻辑

重构挑战响应验证流程，统一响应长度定义，并改进验证算法。

fix(wifi): 修复OTA中继重复触发问题

确保中继状态正确重置，防止在非空闲状态下重复触发中继。

perf(transport): 优化SPI通信时序参数

调整CS片选信号的前后延时参数，提高SPI通信稳定性。

refactor(ui): 分离ESP32和GD32文件上传界面

重构前端界面，为ESP32和GD32分别提供独立的文件上传区域。

main/core/main.cpp

@@ -1,8 +1,6 @@
 /*
  * ESP32-C3FH4 OTA 中继 - 程序入口
- * 四个 FreeRTOS 任务：System Monitor / OTA Relay / WiFi Server / BLE GATT
- * 
- * 新增：周期性状态监控任务，每 10 秒打印系统状态
+ * 三个 FreeRTOS 任务：OTA Relay / WiFi Server / BLE GATT
  */
 #include <stdio.h>
 #include "freertos/FreeRTOS.h"
@@ -20,12 +18,6 @@
 #include "transport/protocol.h"
 #include "monitor/debug_log.h"
 
-/**
- * @brief 状态监控任务
- * @param pvParameters
- */
-static void status_monitor_task(void *pvParameters);
-
 /**
   * @brief 程序主入口，初始化系统组件并创建各 FreeRTOS 任务。
  */
@@ -130,22 +122,6 @@ extern "C" void app_main(void)
         DEBUG_INFO("MAIN", "BLE OTA 任务已创建");
     }
 
-    // 状态监控任务（低优先级，周期性打印系统状态）
-    xRet = xTaskCreatePinnedToCore(
-        status_monitor_task,
-        "status_mon",
-        4096,
-        NULL,
-        configMAX_PRIORITIES - 5,
-        NULL,
-        0
-    );
-    if (xRet != pdPASS) {
-        DEBUG_ERR("MAIN", "创建 status_monitor_task 失败");
-    } else {
-        DEBUG_INFO("MAIN", "状态监控任务已创建");
-    }
-
     DEBUG_INFO("MAIN", "========================================");
     DEBUG_INFO("MAIN", "所有任务创建完成，OTA Relay 运行中");
     DEBUG_INFO("MAIN", "调试日志输出: UDP(%s:%d) + UART0(GPIO21/TX, 115200)", 
@@ -153,83 +129,3 @@ extern "C" void app_main(void)
     DEBUG_INFO("MAIN", "========================================");
 }
 
-// ============================================================
-// 状态监控任务 - 每 10 秒打印系统状态
-/**
-  * @brief 周期性打印系统运行状态，包括内存、WiFi 和 OTA 中继信息。
- * @param pvParameters
- */
-static void status_monitor_task(void *pvParameters)
-{
-    (void)pvParameters;
-    DEBUG_INFO("STAT", "状态监控任务启动");
-
-    uint32_t loop_count = 0;
-
-    while (1) {
-        loop_count++;
-        
-        uint32_t free_heap = esp_get_free_heap_size();
-        uint32_t min_free_heap = esp_get_minimum_free_heap_size();
-        health_state_t health = health_get_current();
-        relay_state_t relay = ota_relay_get_state();
-        int8_t rssi = wifi_get_rssi();
-        bool wifi_conn = wifi_is_connected();
-
-        // 打印状态头
-        DEBUG_INFO("STAT", "========== 系统状态 #%lu ==========", (unsigned long)loop_count);
-        
-        // 内存状态
-        DEBUG_INFO("STAT", "内存: 空闲=%lu 字节, 最低=%lu 字节", 
-                   (unsigned long)free_heap, (unsigned long)min_free_heap);
-        
-        // 健康状态
-        const char *health_str;
-        switch (health) {
-            case SYS_NORMAL:       health_str = "正常"; break;
-            case SYS_WARNING:      health_str = "警告"; break;
-            case SYS_CRITICAL:     health_str = "危险"; break;
-            case SYS_SAFE_SHUTDOWN: health_str = "安全关机"; break;
-            default:               health_str = "未知"; break;
-        }
-        DEBUG_INFO("STAT", "健康状态: %s (%d)", health_str, health);
-
-        // WiFi 状态
-        if (wifi_conn) {
-            DEBUG_INFO("STAT", "WiFi: 已连接, RSSI=%d dBm", rssi);
-        } else {
-            DEBUG_INFO("STAT", "WiFi: 未连接");
-        }
-
-        // OTA 中继状态
-        const char *relay_str;
-        switch (relay) {
-            case RELAY_IDLE:              relay_str = "空闲"; break;
-            case RELAY_HANDSHAKE_IDLE:    relay_str = "等待握手"; break;
-            case RELAY_HANDSHAKE_SENT:    relay_str = "握手请求已发送"; break;
-            case RELAY_CHALLENGE_SENT:    relay_str = "挑战已发送"; break;
-            case RELAY_CHALLENGE_RESPOND: relay_str = "收到握手响应"; break;
-            case RELAY_SESSION_KEY_SENT:  relay_str = "会话密钥已发送"; break;
-            case RELAY_AUTH_COMPLETE:     relay_str = "认证完成"; break;
-            case RELAY_SIZE_SENT:         relay_str = "大小已发送"; break;
-            case RELAY_SIZE_ACK:          relay_str = "大小确认"; break;
-            case RELAY_RECEIVING:         relay_str = "接收中"; break;
-            case RELAY_RELAY_ACTIVE:      relay_str = "转发中"; break;
-            case RELAY_PACKET_SENT:       relay_str = "数据包已发送"; break;
-            case RELAY_PACKET_ACK_OK:     relay_str = "ACK 正常"; break;
-            case RELAY_PACKET_ACK_RETRY:  relay_str = "需要重试"; break;
-            case RELAY_RECEIVE_DONE:      relay_str = "接收完成"; break;
-            case RELAY_TRANSFER_DONE:     relay_str = "传输完成"; break;
-            case RELAY_FINISH_SENT:       relay_str = "结束已发送"; break;
-            case RELAY_DONE:              relay_str = "OTA 完成"; break;
-            case RELAY_ERROR:             relay_str = "错误"; break;
-            default:                      relay_str = "未知"; break;
-        }
-        DEBUG_INFO("STAT", "OTA 中继: %s (%d)", relay_str, relay);
-
-        DEBUG_INFO("STAT", "======================================");
-
-        // 每 10 秒打印一次
-        vTaskDelay(pdMS_TO_TICKS(10000));
-    }
-}