feat(bt): 批①后台常驻框架实施 — meow_media_app_resident按app会话判活跃+should_keep三参(keepalive||bg_audio&&resident)+background_keepalive声明解析透传+amsd EV BG/FG上报;宿主test_media39/test_bgplay/test_bg_keep19全过,0warning;落盘APP_BACKGROUND_KEEPALIVE_P1;降配(nice)待真机未做

patch_v2/meow_launcherd/meow_media.c

@@ -127,6 +127,12 @@ int meow_media_app_playing(const char *app_id)
     return (s->state == MEOW_MEDIA_PLAYING && strcmp(s->app_id, app_id) == 0) ? 1 : 0;
 }
 
+int meow_media_app_resident(const char *app_id)
+{
+    const meow_media_session_t *s = sess_find(app_id);
+    return (s && s->state != MEOW_MEDIA_STOPPED) ? 1 : 0;
+}
+
 static int send_playctl(const meow_media_session_t *s, uint32_t cmd, int64_t seek_ms)
 {
     if (!s || !s->used || !g_ops || !g_ops->send) return -1;