feat(system): 系统框架一期 — 专项服务(性能/电源)+IPC+电源CLI+电菜单改经服务(agent-155)

- meow_svc_power: 单一二进制(svcd空参IPC常驻 /usr/data/meow_power.sock + root CLI免鉴权), 12命令(shutdown/reboot强制=0/upgrade/set-default-hiby/reboot--hiby + set-default-meow/status/screen/dac(status仅)/battery/reboot-reason/upgrade-status); 动作同源sys_do_reboot/set_boot_default_hiby/mtd5=ota:kernel2; dac on/off无控制点不支持
- meow_svc_perf: IPC(/usr/data/meow_perf.sock MSG_PERF_*) + CLI, 聚合/proc/df/thermal/version/uname JSON(与MEOWPANEL_PROTOCOL对齐)
- power_menu.c 改经 meow_power_action(launcher先转储再IPC), 删sys_do_reboot/set_boot_default_hiby; 4动作+8s强关+confirm_reboot_player+3处长按强关全经服务; launcher内 sys_do_reboot/bootmode.sh/set_boot_default_hiby 0调用
- meow_ipc.h 仅加 MSG_PERF_QUERY/RESULT(0x50/51)+MSG_POWER_ACTION/STATUS(0x60/61)+POWER_*(12)+m_perf/power_t; 未动既有
- S89meow_svcd 预置 meow_svc_perf/power.conf(trigger=boot); 各独立socket
- IPC鉴权一期=SO_PEERCRED uid==0基础(完整os.meow.*二期); 通知转储=launcher先转储再IPC(二期补launcher→服务通道); 失败安全(服务不可达→按取消,不静默不直连)
- meow_svc_power=32d6be92/meow_svc_perf=7b0f3b64/launcher=d90f09e9/svcd=fb2d608b(未动)/meow_ui.a=92e61fb8(未改); 全0warning; 备份power_menu.c.pre-svc.bak回退

patch_v2/meow_launcherd/main_menu.c

@@ -555,7 +555,7 @@ static void run_menu(struct app apps[MAX_APPS], int napps, int state,
                  * M2.37：阈值接 power.forceoff_ms（默认 8000），强关保持 > 弹菜单上限。 */
                 if (t - pwr_hold_at >= power_forceoff_ms && !pwr_menu_state) {
                     if (sim_no_exec) { logmsg("pm: [sim-no-exec] POWER HOLD %dms -> would force poweroff", power_forceoff_ms); }
-                    else { logmsg("pm: POWER HOLD %dms -> force poweroff", power_forceoff_ms); sys_do_reboot(LINUX_REBOOT_CMD_POWER_OFF); }
+                    else { logmsg("pm: POWER HOLD %dms -> force poweroff", power_forceoff_ms); meow_power_action(POWER_SHUTDOWN); }
                     m_prev_pwr = pwr; continue;
                 } else if (t - pwr_hold_at >= power_longpress_menu_ms && !pwr_menu_state) {
                     pwr_menu_state = 1;