feat(ble): 完善BLE OTA架构并优化性能

- 实现BLE OTA数据路径分离：添加ble_ota_data.cpp处理重排序/工作线程/DATA_IN，
  和ble_ota_host.cpp处理GATT/GAP/广播/主机功能
- 将滑动ACK窗口从32增大到64，实测Windows WebBT环境下固件传输速度提升约10%
  （从40KB/s提升到44KB/s），内存消耗约30KB重排序缓冲区
- 优化调试日志级别，将OTA相关信息从INFO调整为DBG以减少日志冗余

refactor(can): 改进CAN反馈监听机制

- 将CAN反馈任务从1Hz主动轮询模式改为被动事件监听模式，
  使用SpiMaster::takeEvent()替代主动发送0xC1轮询请求
- 更新相关头文件注释说明架构变更，将"周期性轮询"改为"被动接收推送"
- 修改调试日志级别，将暂停/恢复状态日志从INFO调整为DBG

main/server/ble_ota_priv.h

@@ -0,0 +1,120 @@
+/*
+ * ble_ota_priv.h - BLE OTA 内部共享声明（仅 server/ble_ota*.cpp 使用）
+ *
+ * 拆分：
+ *   ble_ota.cpp      — 单例/会话/收尾/公开 API
+ *   ble_ota_data.cpp — 乱序缓冲、数据写路径、worker
+ *   ble_ota_host.cpp — GATT/GAP/广播/Host
+ */
+#pragma once
+
+#include <string.h>
+#include <inttypes.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "freertos/semphr.h"
+#include "freertos/queue.h"
+#include "esp_err.h"
+#include "esp_ota_ops.h"
+#include "esp_system.h"
+#include "esp_timer.h"
+#include "esp_wifi.h"
+
+#include "nimble/nimble_port.h"
+#include "nimble/nimble_port_freertos.h"
+#include "host/ble_hs.h"
+#include "host/ble_gap.h"
+#include "nimble/ble.h"
+#include "services/gap/ble_svc_gap.h"
+#include "services/gatt/ble_svc_gatt.h"
+#include "host/ble_att.h"
+
+#include "app_config.h"
+#include "version.h"
+#include "ble_ota.h"
+#include "esp32_ota_core.h"
+#include "ota_coordinator.h"
+#include "ota_relay.h"
+#include "storage/gd32_flash_store.h"
+#include "health_monitor.h"
+#include "monitor/debug_log.h"
+
+#define TAG "BLE_OTA"
+#define BLE_OTA_NOTIFY_ACK 0xA1
+#define BLE_OTA_NOTIFY_FINISH 0xB1
+#define BLE_OTA_NOTIFY_SHA256 0xC1
+#define BLE_OTA_FINISH_DONE 0x02
+#define BLE_OTA_FINISH_REBOOT_NOW 0x07
+#define BLE_OTA_FINISH_GD32_RELAY_START 0x10
+#define BLE_OTA_FINISH_GD32_RELAY_DONE 0x11
+#define BLE_OTA_FINISH_ABORTED       0x20
+#define BLE_ATT_ERR_OTA_BUSY 0x80
+#define BLE_OTA_FINISH_ERR_FINALIZE 0x81
+#define BLE_OTA_FINISH_ERR_MUTEX 0x83
+#define BLE_OTA_FINISH_ERR_GD32_SIZE 0x84
+#define BLE_OTA_FINISH_ERR_SHA_MISMATCH 0x85
+#define BLE_OTA_FINISH_ERR_GD32_RELAY 0x86
+
+struct BleOtaDataBatch {
+    uint8_t *data;
+    size_t   len;
+};
+
+struct BleGd32RelayWaitCtx {
+    uint16_t session_id;
+};
+
+struct BleEsp32FinishCtx {
+    char sha_hex[65];
+    uint16_t session_id;
+};
+
+struct BleFinishCtxDeleter {
+    BleEsp32FinishCtx *p;
+    explicit BleFinishCtxDeleter(BleEsp32FinishCtx *ctx) : p(ctx) {}
+    ~BleFinishCtxDeleter() { if (p) { free(p); p = nullptr; } }
+    BleFinishCtxDeleter(const BleFinishCtxDeleter&) = delete;
+    BleFinishCtxDeleter& operator=(const BleFinishCtxDeleter&) = delete;
+};
+
+extern QueueHandle_t s_otaDataQueue;
+extern uint16_t s_data_out_val_handle;
+extern bool s_wifi_ps_boosted;
+/** GAP 连接参数回退请求标志（定义在 ble_ota_data.cpp，host 连接事件读写） */
+extern bool s_conn_fallback_requested;
+
+void drainOtaDataQueue();
+void ble_ota_start_advertising(void);
+void sendWindowAck(uint8_t cmd, uint16_t seq, uint32_t completed_bytes);
+void sendFinishEvent(uint8_t stage, uint32_t value);
+uint32_t packBleFinishValue(uint16_t session_id, uint16_t code);
+void shaBytesToHexUpper(const uint8_t sha[32], char out_hex[65]);
+void sendSha256Notify(const uint8_t sha[32], uint16_t session_id);
+void esp32_reorder_free();
+void ble_ota_session_reset(void);
+void ble_ota_restore_wifi_ps(void);
+void ble_ota_boost_wifi_ps(void);
+void ble_ota_data_worker_task(void *pvParameters);
+void ble_gd32_relay_wait_task(void *pvParameters);
+int ble_ota_mbuf_to_buf(struct os_mbuf *om, uint8_t *buf, size_t buf_len);
+void ble_ota_on_sync(void);
+void ble_ota_on_reset(int reason);
+void ble_ota_nimble_host_task(void *param);
+int ble_ota_gap_event(struct ble_gap_event *event, void *arg);
+uint16_t ble_ota_log_conn_params(uint16_t conn_handle, const char *phase);
+int ble_ota_request_conn_params(uint16_t conn_handle, bool windows_compatible);
+void ble_esp32_restart_task(void *pvParameters);
+void ble_esp32_finish_and_reboot_task(void *pvParameters);
+int ble_ota_ctrl_access(uint16_t conn_handle, uint16_t attr_handle,
+                        struct ble_gatt_access_ctxt *ctxt, void *arg);
+int ble_ota_data_in_access(uint16_t conn_handle, uint16_t attr_handle,
+                           struct ble_gatt_access_ctxt *ctxt, void *arg);
+int ble_ota_data_out_access(uint16_t conn_handle, uint16_t attr_handle,
+                            struct ble_gatt_access_ctxt *ctxt, void *arg);
+int ble_ota_version_access(uint16_t conn_handle, uint16_t attr_handle,
+                           struct ble_gatt_access_ctxt *ctxt, void *arg);
+
+extern const struct ble_gatt_svc_def gatt_ota_svcs[];