feat: 诗词答题页面主题色支持与代码重构

- 创建 poetry-page.dart，提取 UI 组件（PoetryOptionItem、PoetryOptionsLayout、PoetryTag）
- 修改 poetry.dart，使用新组件，添加主题色支持
- 修改 flow-anim.dart，添加主题色支持
- 修改 distinguish.dart，添加主题色支持
- 支持动态主题色切换
- 支持深色模式
- 保持页面布局不变

lib/views/profile/level/flow-anim.dart

@@ -4,6 +4,7 @@ import 'package:flutter/material.dart';
 import 'package:get/get.dart';
 
 import '../../../services/get/theme_controller.dart';
+import '../../../models/colors/theme_colors.dart';
 
 /// 流动边框装饰器
 class FlowingBorderDecoration extends Decoration {
@@ -108,7 +109,10 @@ class _FlowingBorderContainerState extends State<FlowingBorderContainer>
   @override
   Widget build(BuildContext context) {
     return Obx(() {
-      final color = widget.color ?? _themeController.currentThemeColor;
+      final color =
+          widget.color ??
+          ThemeColors.getThemeColor(_themeController.themeColorIndexRx.value);
+
       return AnimatedBuilder(
         animation: _animation,
         builder: (context, child) {