feat(tuku): 图库 M3 骨架——书库浏览/主题同步/阅读器与锁屏接缝

- 新增顶层 tuku/ 工程（package dev.tuku.app、二进制 tuku）：app.c/internal 头/logic/ui 分层、app.json、build/pack 脚本
- 书库：从 TF 卡根浏览文件夹，含图目录=一本书；logic/library 纯 C 扫描+自然排序（page2<page10）
- 流式缩略图：后台线程解码+meow_img_downscale(96)，首帧/滚动不阻塞；磁盘缓存 MeowData/<pkg>/cache（mtime 失效+LRU）
- 列表 meow_listview 虚拟化 + meow_scroll fling/snap；行=缩略图+目录名+页数
- 主题：全部语义色 + meow_theme_add_listener 即时重绘；明暗/风格族两态可读
- 导航：meow_view page push/pop、TopAppBar ⚙→设置；reader/settings/lock 最小桩
- 接缝：mr_reader_get/set_direction（默认 RTL）、lock_view_should_show()（桩 0）
- 宿主 gcc 测试 46 项 PASS；交叉构建静态 MIPS32r2 ELF、-Wall -Wextra 零警告

tuku/ui/reader/reader.c

@@ -0,0 +1,85 @@
+/* ui/reader/reader.c — 阅读器页（ACT_READER，全屏）M3 骨架。
+ *
+ * M4 在此实现翻页/图片显示；本批只落可编译桩 + 既有接缝：
+ *   - 书库经 mr_reader_open_dir(path) 导航进来（app.c/library.c 不改）；
+ *   - 方向状态走 logic/reader 的 mr_reader_get/set_direction（默认 RTL）。
+ * 绘制走 view on_draw（注册表驱动），主题切换由 app.c 的 listener invalidate 全屏重画。
+ */
+#include "tuku_internal.h"
+
+#include <stdio.h>
+#include <string.h>
+
+static mr_page_ctrl g_ctrl;
+static char g_dir[MR_PATH_MAX];
+
+const char *mr_reader_dir(void)
+{
+    return g_dir;
+}
+
+void mr_reader_open_dir(const char *path)
+{
+    if (!path) return;
+    snprintf(g_dir, sizeof g_dir, "%s", path);
+    meow_log(MEOW_LOG_INFO, "reader open: %s", g_dir);
+    meow_view_page_push(ACT_READER);
+}
+
+void reader_on_tap(int x, int y)
+{
+    (void)x; (void)y;
+    if (!g_ctrl.active) return;
+    mr_reader_set_direction(mr_reader_get_direction() == MR_DIR_RTL ? MR_DIR_LTR : MR_DIR_RTL);
+    meow_ui_invalidate(0, 0, meow_ui_width(), meow_ui_height());
+}
+
+static void reader_draw(meow_view *v, const meow_theme *th, void *ctx)
+{
+    (void)v; (void)ctx;
+    int w = meow_ui_width();
+    const char *dir = g_dir[0] ? g_dir : "(no directory)";
+    size_t n = strlen(dir);
+    if (n > 64) dir += n - 64;
+
+    meow_ui_text_center(w / 2, 160, "READER", th->font_title, th->primary);
+    meow_ui_text_center(w / 2, 200, "(M4 will render pages here)", th->font_body,
+                        th->onSurfaceVariant);
+    meow_ui_text_center(w / 2, 280, "Folder:", th->font_body, th->onSurfaceVariant);
+    meow_ui_text_center(w / 2, 308, dir, th->font_body, th->onSurface);
+    meow_ui_text_center(w / 2, 372,
+                        mr_reader_get_direction() == MR_DIR_RTL ? "Direction: RTL" : "Direction: LTR",
+                        th->font_body, th->onSurface);
+    meow_ui_text_center(w / 2, 420, "tap = toggle direction", th->font_body, th->onSurfaceVariant);
+    meow_ui_text_center(w / 2, 448, "left-edge swipe = back", th->font_body, th->onSurfaceVariant);
+}
+
+static void reader_page_enter(meow_view *v, void *ctx)
+{
+    ((mr_page_ctrl *)ctx)->active = 1;
+    v->x = 0;
+    v->y = 0;
+    v->w = meow_ui_width();
+    v->h = meow_ui_height();
+    meow_ui_set_fullscreen(1);                 /* app.json route.reader.fullscreen 的运行时兜底 */
+    meow_ui_set_page_bg(meow_theme_get()->bg);
+    mr_nav_report();
+    meow_ui_paint_full();
+}
+
+static void reader_page_leave(meow_view *v, void *ctx)
+{
+    (void)v;
+    ((mr_page_ctrl *)ctx)->active = 0;
+    meow_ui_set_fullscreen(0);
+}
+
+meow_view *reader_view_create(void)
+{
+    static const meow_view_hooks h = {
+        .on_enter = reader_page_enter,
+        .on_leave = reader_page_leave,
+        .on_draw  = reader_draw,
+    };
+    return meow_view_create(ACT_READER, MEOW_VIEW_ACTIVITY, &h, &g_ctrl);
+}