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/event.c

@@ -117,12 +117,12 @@ void Event_Dispatcher_Loop(void)
         return;
     }
 
-    inactivity_timer = 0; // 捕获到有效事件，清零休眠计时器，重置闲置超时
-
-    // 串口打印调试信息
-    XTELL_LOG("[EVENT] key=");
-    XTELL_LOG_HEX8((u8)evt.key_event);
-    XTELL_LOG("\r\n");
+    // 串口打印调试信息 (整秒滴答事件每秒都会触发一次，不打印以免刷屏)
+    if (evt.key_event != KEY_EVENT_SECOND_TICK) {
+        XTELL_LOG("[EVENT] key=");
+        XTELL_LOG_HEX8((u8)evt.key_event);
+        XTELL_LOG("\r\n");
+    }
 
     // SOS 按键紧急处理：若当前前台不为 SOS 应用，接收到 SOS 键动作，立即强行切入到 SOS_APP 并执行求救
     if ((evt.key_event == KEY_EVENT_SOS_CLICK || evt.key_event == KEY_EVENT_SOS_LONG) &&
@@ -181,16 +181,6 @@ void Event_KeyScan_Poll(void)
         }
     }
 
-    // 检测到有任意按键处于下压状态，立即将无操作闲置休眠计时器归零
-        if (raw_up || raw_down || raw_confirm || raw_sos) {
-            inactivity_timer = 0;
-        } else {
-            // 如果在常态下（非休眠、非报警、非紧急求救），累加闲置时间
-            if (current_state != STATE_SLEEP && current_state != STATE_ALARM && current_state != STATE_SOS_EMITTED) {
-                inactivity_timer++;
-            }
-        }
-
         // 默认将派发事件重置为空
         evt.key_event = KEY_EVENT_NONE;
         evt.priority = EVENT_PRIORITY_NORMAL;