refactor(event): replace global 60s inactivity timer with per-second tick event

Adds KEY_EVENT_SECOND_TICK, generated once per real second from
Clock_IncMS() via a new second_tick_flag and pushed through the normal
event queue, so every foreground App's onEvent() receives it and
decides independently whether to act. Removes the old global
inactivity_timer (60s sleep from anywhere) entirely. HomeApp now
accumulates its own idle-second counter and sleeps after 10s idle
specifically while on the home screen; MenuApp's existing 10s
auto-close is converted from onRun() polling to the same tick+reset
pattern for consistency. Any non-tick key event resets each app's own
counter to 0.

App/main.c

@@ -49,7 +49,6 @@ Sensor_Slot xdata sensor_list[16];
 
 // 全局滴答与定时中断计数变量，位于 volatile 防止被编译器优化
 volatile u16 ms_tick = 0;                 // 定时中断 1ms 基准滴答累加器
-volatile u16 inactivity_timer = 0;        // 用户闲置计时器，用于无操作判定（单位: 10ms）
 volatile u32 pair_timeout_ms = 0;         // 传感器配对对码超时毫秒计时器 (上限 30000ms 即 30s)
 volatile u16 alarm_timer_ms = 0;          // 入侵报警马达震动时序计数器
 volatile u16 motor_timer_ms = 0;          // 独立马达震动时长计数器
@@ -120,7 +119,6 @@ void RGB_Diagnostic_Test(void)
 void Debug_ProcessCommand(char cmd)
 {
     SystemEvent debug_evt;
-    inactivity_timer = 0; // 收到指令，立即重置用户的无操作闲置计时器
     debug_evt.extra_data = 0;
     debug_evt.extra_size = 0;
 
@@ -206,8 +204,11 @@ void Debug_ProcessCommand(char cmd)
         }
         Uart_SendString("[UART] State: DISARMED\r\n");
     } else if (cmd == 'z' || cmd == 'Z') {
-        inactivity_timer = 6000; // 模拟闲置 60 秒超时，强制触发主循环深度休眠
+        // 直接强制进入低功耗休眠，测试用 (原来靠伪造全局闲置计时器触发，现改为直接调用)
         Uart_SendString("[UART] Force Entering Sleep mode!\r\n");
+        current_state = STATE_SLEEP;
+        Enter_Low_Power_Sleep();
+        AppManager_SwitchToForeground(&home_app); // 唤醒后强制重绘时钟画面
     } else if (cmd == 'q' || cmd == 'Q') {
         RGB_Diagnostic_Test();   // 启动 RGB 物理颜色通道排查测试
     } else if (cmd == 't' || cmd == 'T') {
@@ -316,6 +317,21 @@ void main(void)
             Event_KeyScan_Poll();
         }
 
+        /* 0.5 检查整秒滴答标志 (由 Clock_IncMS 每秒置位一次)，转换为事件入队分发；
+         *     各 App 自行决定要不要用它累计自己的闲置时长 (收到任何按键事件就清零)，
+         *     不再由主循环维护一个全局的休眠倒计时。 */
+        if (second_tick_flag) {
+            second_tick_flag = 0;
+            {
+                SystemEvent tick_evt;
+                tick_evt.key_event = KEY_EVENT_SECOND_TICK;
+                tick_evt.priority = EVENT_PRIORITY_LOW;
+                tick_evt.extra_data = 0;
+                tick_evt.extra_size = 0;
+                EventQueue_Push(tick_evt);
+            }
+        }
+
         /* 1. 串口非阻塞指令捕获 -> 装配为事件方式入队 */
         cmd = Uart_RxChar();
         if (cmd != '\0') {
@@ -329,15 +345,6 @@ void main(void)
 
         /* 3. 应用调度中心：运行当前处于前台活跃状态的应用（集成了 CPU 运行时间超时挂起保护） */
         AppManager_RunActiveApp();
-
-        /* 4. 自动休眠判定：常态无操作闲置达到 60 秒 (6000 * 10ms = 60s) 时，切入低功耗停机休眠 */
-        if (inactivity_timer >= 6000) {
-            inactivity_timer = 0;
-            current_state = STATE_SLEEP; // 系统置为休眠状态
-            Enter_Low_Power_Sleep();     // 该函数是阻塞的，MCU 将在此挂起。唤醒后将自动从其后继续执行
-            current_state = STATE_NORMAL; // 唤醒后重新置为正常待机状态
-            AppManager_StartApp(APP_ID_HOME); // 重新开启时钟应用以刷新画面和背光
-        }
     }
 }