feat(main): 添加启动模块自检与汇总功能

- 新增 SystemBoot 类用于跟踪各模块初始化状态，提供位图标记与报告功能
- 在 main.cpp 中重构初始化流程，按顺序初始化各模块并记录状态
- 添加 system_boot.cpp 模块文件到构建配置
- CAN反馈任务增加冷启动延迟，避免与GD32初始化窗口冲突

refactor(ota): 优化OTA协调器线程安全机制

- 修改 lock()/unlock() 方法返回take结果，确保mutex正确释放
- 修复多任务并发时mutex死锁问题，避免vTaskPriorityDisinherit断言
- 统一finalize失败后的状态复位逻辑，确保协调器回到IDLE状态
- 优化忙状态超时检测与自愈机制

perf(boot): 优化冷启动时序与资源管理

- 简化README中冷启动优化说明，聚焦核心逻辑
- 优化BOD阈值设置为LVL5，改进电源稳定性
- 增加BLE OTA工作线程优先级，减少丢包情况
- 优化堆告警节流机制，在OTA期间降低告警频率

fix(relay): 改进GD32应用存活检测逻辑

- 调整GD32 APP存活验证时序，增加会话建立验证
- 修复HELLO建立session后未验证role的问题
- 优化FINISH后等待APP启动的静默时间与重试机制
- 统一GD32探测逻辑到OTA中继任务

refactor(server): 优化HTTP服务端内存与性能

- 使用静态缓冲区替代动态分配，减少堆碎片化风险
- 优化CAN批量发送期间暂停反馈任务的机制
- 调整BLE连接参数请求逻辑，提升传输性能
- 改进错误处理流程，避免堆紧张时的额外分配

bump(version): 更新固件版本至0.3.50

- 更新版本号从0.3.49到0.3.50
- 更新编译时间戳与Git哈希值

tools/js/can.js

@@ -20,7 +20,7 @@
 import {
   state, el, getBaseUrl, getDeviceIp, setDeviceIp, parseDbc, readDbcText, buildSummary,
   rebuildMergedDbc, makeDbcSourceId
-} from './can/dbc.js?v=20260717w';
+} from './can/dbc.js?v=20260717x';
 import {
   updateDbcFileInfo,
   filterMessages,
@@ -30,12 +30,11 @@ import {
   recomputeTransmitterFilterEmpty,
   updateNodeFilterLabel,
   updateBatchUi
-} from './can/messages.js?v=20260717w';
+} from './can/messages.js?v=20260717x';
 import {
   ensureMessageDefaults,
-  renderSelectedMessage,
   updateEncodedPreview
-} from './can/signals.js?v=20260717w';
+} from './can/signals.js?v=20260717x';
 import {
   renderHistory,
   sendSelectedMessage,
@@ -44,15 +43,15 @@ import {
   sendManualFrame,
   resetManualFields,
   loadPreviewToManual
-} from './can/send.js?v=20260717w';
+} from './can/send.js?v=20260717x';
 import {
   scheduleCanPersist,
   loadCanSession,
   bindCanPersistLifecycle
-} from './can/persist.js?v=20260717w';
-import { escapeHtml as sanitizeHtml, formatUptime } from './common/utils.js?v=20260717w';
-import { showToast } from './common/toast.js?v=20260717w';
-import { initCanMonitor } from './can_monitor.js?v=20260717w';
+} from './can/persist.js?v=20260717x';
+import { escapeHtml as sanitizeHtml, formatUptime } from './common/utils.js?v=20260717x';
+import { showToast } from './common/toast.js?v=20260717x';
+import { initCanMonitor } from './can_monitor.js?v=20260717x';
 
 // ==================== 本地工具 ====================
 // 原 can.js 的 formatUptime 输出格式与 common/utils.js 略有差异（d>0 时只到 h），
@@ -63,10 +62,10 @@ import { initCanMonitor } from './can_monitor.js?v=20260717w';
 function cacheElements() {
   [
     'toolIp', 'defaultChannel', 'manualChannel', 'manualId', 'manualDlc', 'manualData',
-    'dbcDropZone', 'dbcFileInput', 'dbcFileInfo', 'dbcFileName', 'dbcMessageCount',
+    'dbcDropZone', 'dbcFileInput', 'dbcFileInfo', 'dbcMessageCount',
     'dbcSignalCount', 'dbcNodeCount', 'dbcFileSize', 'dbcFileCount', 'dbcFileChips',
     'dbcSearch', 'dbcHint', 'clearDbcBtn',
-    'importDbcBtn', 'replaceDbcBtn',
+    'importDbcBtn',
     'messageList', 'sendSelectedBtn', 'generatedHex', 'generatedBytes', 'encodeHint',
     'dbcResp', 'dbcRespText', 'loadPreviewToRawBtn', 'manualHint', 'sendManualBtn',
     'resetManualBtn', 'manualResp', 'manualRespText', 'historyList', 'toast', 'toastIco',
@@ -149,11 +148,10 @@ function afterDbcSourcesChanged(opts) {
     if (opts.resetSelection || !state.selectedMessageKey) {
       selectMessage(state.dbc.messages[0].key);
     } else {
-      renderSelectedMessage();
       updateEncodedPreview();
     }
   } else {
-    renderSelectedMessage();
+    updateEncodedPreview();
   }
   if (el.dbcHint) {
     el.dbcHint.hidden = true;
@@ -268,7 +266,6 @@ function bindEvents() {
       if (el.manualChannel) el.manualChannel.value = el.defaultChannel.value;
       if (el.canChannelPill) el.canChannelPill.textContent = 'CH' + el.defaultChannel.value;
       renderMessageList();
-      renderSelectedMessage();
       updateEncodedPreview();
       scheduleCanPersist();
     });
@@ -277,7 +274,6 @@ function bindEvents() {
     if (el.dbcFileInput) el.dbcFileInput.click();
   }
   if (el.importDbcBtn) el.importDbcBtn.addEventListener('click', openDbcPicker);
-  if (el.replaceDbcBtn) el.replaceDbcBtn.addEventListener('click', openDbcPicker);
   if (el.dbcDropZone) {
     el.dbcDropZone.addEventListener('dragover', function (event) {
       event.preventDefault();
@@ -389,7 +385,7 @@ function init() {
       selectMessage(state.dbc.messages[0].key);
     }
   } else {
-    renderSelectedMessage();
+    updateEncodedPreview();
   }
   updateBatchUi();
   refreshManualHint();