feat(sdk+launcher): SDK nav/media封装 + §10.5 App前台唤起通知中心 (agent-206) — meow_ui_nav.c(env栈初始化+report/request_exit) + meow_ui_media.c(懒连断线重连, meta上报+playctl接收) + MSG_NOTIF_OPEN=0x28/CLOSE=0x29(0x25/26已被占); SDK顶部下滑手势→IPC; launcher App前台会话叠加通知中心(SIGSTOP→读帧→接管输入→恢复SIGCONT, 面板内App崩溃即关); hello接线验证

meow_ui.a→9a8eb7ef; hello→fc299577; launcher→b33da20a; 宿主5套件+新test_notif_open+qemu分发 全过
出入: SDK符号用meow_ui_前缀防与launcher内同名冲突; 叠加会话真机待验; §10.5文档旧号段已过时

patch_v2/hello_app/ui/full.c

@@ -27,6 +27,7 @@ static void full_page_enter(meow_view *v, void *ctx)
     g_full = 1;
     meow_ui_set_fullscreen(1);
     meow_ui_statusbar_set_collapsed(1);
+    hello_nav_report();       /* ① 上报 full 栈深/顶层 */
     full_draw();
     meow_log(MEOW_LOG_INFO, "fullscreen ON (collapsed), activity->%d", meow_ui_activity_active());
 }