feat(ui): 重构设置界面为页面控制器架构

- 添加新的UI页面基础架构(ui_page.h)，包含页面操作接口
- 创建设置页面控制器(ui_settings_controller.h/.c)来管理页面导航
- 实现具体的设置页面类型：根页面、BLE页面、主题页面
- 修改display_module.c以使用新的页面系统替代旧的状态机
- 移除过时的settings_ui.h头文件和相关状态结构
- 更新事件处理逻辑以使用页面指针而非状态数据传递
- 修改主界面实现以适配统一的页面接口标准

src/ui/ui_settings_root.c

@@ -0,0 +1,64 @@
+#include <lvgl.h>
+
+#include <zephyr/sys/util.h>
+
+#include "ui/ui_settings_controller.h"
+#include "ui_settings_pages.h"
+
+static uint8_t root_get_count(struct ui_settings_page *page)
+{
+	ARG_UNUSED(page);
+	return 2U;
+}
+
+static void root_get_item(struct ui_settings_page *page, uint8_t index,
+			  struct ui_settings_item *item)
+{
+	ARG_UNUSED(page);
+
+	if (index == 0U) {
+		item->icon = LV_SYMBOL_BLUETOOTH;
+		item->title = "Bluetooth";
+		item->value = ui_settings_ble_current_label();
+		return;
+	}
+
+	item->icon = LV_SYMBOL_TINT;
+	item->title = "Theme";
+	item->value = ui_settings_theme_current_name();
+}
+
+static void root_on_enter(struct ui_settings_page *page)
+{
+	page->selected = 0U;
+}
+
+static void root_on_select(struct ui_settings_page *page, uint8_t index)
+{
+	ui_settings_controller_switch_to(
+		(index == 0U) ? &ui_settings_ble_page : &ui_settings_theme_page,
+		&page->base);
+}
+
+static void root_on_back(struct ui_settings_page *page)
+{
+	ARG_UNUSED(page);
+	ui_settings_controller_close();
+}
+
+static const struct ui_settings_page_ops root_ops = {
+	.get_count = root_get_count,
+	.get_item = root_get_item,
+	.on_enter = root_on_enter,
+	.on_select = root_on_select,
+	.on_back = root_on_back,
+};
+
+struct ui_settings_page ui_settings_root_page = {
+	.base = {
+		.ops = &root_ops.base,
+	},
+	.ops = &root_ops,
+	.title = LV_SYMBOL_SETTINGS " Settings",
+	.hint = "Rotate select  Tap OK  Hold exit",
+};