feat(vd960DBN): BLE 读取脱机日志 — OFFLOG_STAT/QUERY/CLEAR (0x25/0x26/0x27)
蓝牙通道补齐脱机日志读取 (此前仅 MQTT V1.06 / TCP JSON V1.02 有 log_* 命令):
- 3 条 BLE 命令, 语义对齐 MQTT log_stat/log_query/log_clear
- QUERY 直接传 32B OfflogEvt 原始结构 (二进制协议, 无需 JSON), 复用
idx = start_seq - seq_first 定位, 不新增 offlog API
- 缓冲扩容: MAX_BLE_TMP_BUF_LEN 100→132, 新增 MAX_BLE_DAT_BUF_LEN=132
(QUERY 响应 1+4x32B=129B), clear_buf_dbn_ble_all memset 同步
- 新协议文档 docs/DLD960_BLE协议.md V1.00 (帧格式+分包+命令+记录结构)
- 隔离测试 test_ble_offlog.c 嵌入源文件 3 case 真实文本, 7 例全过;
offlog 回归 8 例 ALL PASS
- devlog V4.0; README 协议矩阵补 BLE 行
wangfq
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