feat: 添加设置模块和相关UI功能

- 新增settings_module.c实现设置菜单逻辑，包括蓝牙配对槽位管理和主题颜色选择
- 添加settings_mode_event.h/.c和settings_view_event.h/.c事件定义用于设置模式切换
- 创建settings_ui.h定义设置界面状态结构体和页面枚举
- 修改display_module.c集成设置UI显示逻辑，支持主界面和设置界面切换
- 在keyboard_core_module.c中添加设置活动状态检查，避免设置模式下键盘输入冲突
- 更新CMakeLists.txt包含新的源文件：settings_module.c、ui_settings.c及新事件文件
- 修改prj.conf调整LVGL内存池大小从16KB到32KB以支持更复杂UI渲染
- 移除BLE配对擦除相关配置选项并增加长按检测时间到1500毫秒
- 更新ui_main.c添加可见性控制函数用于界面切换

inc/settings_ui.h

@@ -0,0 +1,56 @@
+#ifndef BLINKY_SETTINGS_UI_H_
+#define BLINKY_SETTINGS_UI_H_
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "theme_color.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define SETTINGS_UI_ROOT_ITEM_COUNT 2U
+#define SETTINGS_UI_BLE_SLOT_COUNT 3U
+#define SETTINGS_UI_BLE_ITEM_COUNT 4U
+#define SETTINGS_UI_THEME_OPTION_COUNT 6U
+#define SETTINGS_UI_TITLE_MAX 20U
+#define SETTINGS_UI_VALUE_MAX 24U
+#define SETTINGS_UI_THEME_NAME_MAX 16U
+
+enum settings_ui_page {
+	SETTINGS_UI_PAGE_ROOT = 0,
+	SETTINGS_UI_PAGE_BLE,
+	SETTINGS_UI_PAGE_THEME,
+};
+
+struct settings_ui_list_item {
+	char title[SETTINGS_UI_TITLE_MAX];
+	char value[SETTINGS_UI_VALUE_MAX];
+};
+
+struct settings_ui_theme_option {
+	char name[SETTINGS_UI_THEME_NAME_MAX];
+	struct theme_rgb color;
+};
+
+struct settings_ui_state {
+	bool active;
+	enum settings_ui_page page;
+	uint8_t root_selected;
+	uint8_t ble_selected;
+	uint8_t theme_selected;
+	uint8_t active_ble_slot;
+	struct theme_rgb accent;
+	struct settings_ui_list_item root_items[SETTINGS_UI_ROOT_ITEM_COUNT];
+	struct settings_ui_list_item ble_items[SETTINGS_UI_BLE_ITEM_COUNT];
+	struct settings_ui_theme_option
+		theme_options[SETTINGS_UI_THEME_OPTION_COUNT];
+	uint8_t theme_option_count;
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* BLINKY_SETTINGS_UI_H_ */