feat: M6.40批 — 阅读器UI改版(书架list·grid+空态骨架+界面设置+App设置页+header·footer+背景黑默认) + 系统级音量翻页映射 + P1 MD3(select面板28/对话框按钮胶囊) + MeowPanel写端点护栏 + SDK公开仓·文档同步

- reader: app.c/shelf.c/reader.c 全套UI; 新增 reader_conf(reader.conf)/settings(App设置页)/reader_ipc(音量翻页IPC响应); app.json加volume_page
- launcher: keys.c meow_volpage_*门 + util.c app_id→fd映射(HELLO记fd/断开清) + app_launcher.c 前台三处接线(进入sink/按键路径volpage_key/离开clear) → 前台声明volume_page的App音量键→MSG_KEY_PAGEUP/PAGEDOWN翻页(非阅读器前台音量照旧)
- sdk: meow_select.c 底部面板28 + meow_ui_dialog.c 对话框按钮胶囊(h/2) + test_meow_ui_select.c修采样
- meowpanel: /api/net/policy·/api/power/policy 加防自锁+policy默认关两条护栏(panel.policy_enabled默认0)
- 文档: MEOW_APP_SDK.md §12.6 + meowpanel README端点表

0warning;宿主测试全过;二进制留批量批次未入库

patch_v2/reader_app/app.c

@@ -6,10 +6,12 @@
  */
 #include "reader_internal.h"
 #include "meow_ui_internal.h"   /* 阅读页 blit 需要 back_buf 访问器（决策见报告） */
+#include "app/reader_ipc.h"
 #include <signal.h>
 
 static meow_view *g_shelf_view;
 static meow_view *g_reader_view;
+static meow_view *g_settings_view;
 
 static void on_sigterm(int s) { (void)s; meow_ui_request_exit(); }
 
@@ -17,6 +19,7 @@ static void app_on_key(int keycode, int is_down) { (void)keycode; (void)is_down;
 
 static void app_on_tap(int x, int y)
 {
+    if (settings_is_active()) { settings_on_tap(x, y); return; }
     if (reader_is_active()) { reader_on_tap(x, y); return; }
     shelf_on_tap(x, y);
 }
@@ -24,7 +27,9 @@ static void app_on_tap(int x, int y)
 static void app_on_swipe(int dir, int dx, int dy)
 {
     (void)dy; (void)dx;
+    if (settings_is_active()) { return; }        /* 设置页滑动不翻页 */
     if (reader_is_active()) { reader_on_swipe(dir, dx, dy); return; }
+    if (shelf_is_active()) { shelf_on_swipe(dir, dx, dy); return; }
     if (dir == MEOW_SWIPE_LEFT) { meow_ui_request_exit(); }
 }
 
@@ -53,13 +58,17 @@ int main(void)
 
     g_shelf_view = shelf_view_create();
     g_reader_view = reader_view_create();
+    g_settings_view = settings_view_create();
 
     meow_view_page_push(ACT_SHELF);
+    reader_ipc_start();       /* E：系统翻页信号接收（后台线程，best-effort） */
 
     meow_ui_events ev = { app_on_key, app_on_tap, app_on_swipe, app_on_tick,
                           NULL, app_on_touch_down, app_on_touch_move };
     meow_ui_run(&ev);
 
+    reader_ipc_stop();
+    meow_view_free(g_settings_view);
     meow_view_free(g_reader_view);
     meow_view_free(g_shelf_view);
     meow_ui_shutdown();