feat(sdk): meow_config_* App配置读写API(agent-158)

- 6 API: meow_config_dir/set/get/int/bool/remove; 落 TF MeowData/<pkg>/data/<key>.cfg(env MEOW_DATA_DIR, 回退/tmp/meowcfg_<pid>)
- 与系统设置 meow_settings_*(板载settings.conf) 区分; key清洗[A-Za-z0-9._-]→_ 防路径穿越; 值上限4096; 降级不崩(pthread_once/mutex)
- MEOW_CFG_* 错误码(避开 meow_ipc.h 枚举命名空间, 防宏展开冲突); 数值与 MEOWOS_API/meow_settings.h 同值
- meow_ui.a=92e61fb8(新增config成员) hello=5e31d919不变(0回归, 静态链未拉入新成员); build_sdk 0warning; 宿主test_meow_ui_config ALL PASS
- 未重链launcher(launcher未用config); 遗留真机验证MEOW_DATA_DIR落盘/无卡降级

patch_v2/sdk/build_sdk.sh

@@ -10,7 +10,7 @@ AR="${AR:-/usr/bin/ar}"   # 系统 GNU ar 即可归档 mipsel ELF 对象（架
 rm -f meow_ui.a *.o
 
 # -I../meow_launcherd：meow_notify_ipc.c 复用共享协议头 meow_ipc.h（同一份、杜绝两端漂移）
-OBJS="meow_ui_gfx meow_ui_log meow_ui_notify meow_notify_ipc meow_ui_img meow_ui_widget meow_ui_input meow_ui_theme meow_ui_ime meow_ui_sys meow_ui_vol meow_ui_activity meow_ui_global meow_ui_dialog stb_image"
+OBJS="meow_ui_gfx meow_ui_log meow_ui_notify meow_notify_ipc meow_ui_img meow_ui_widget meow_ui_input meow_ui_theme meow_ui_ime meow_ui_sys meow_ui_vol meow_ui_activity meow_ui_global meow_ui_dialog meow_ui_config stb_image"
 CFLAGS="-Os -static -I$ROOT/patch_v2/meow_launcherd"
 for f in $OBJS; do
   echo "== cc $f =="