feat: 新增过渡页面路由、上传组件及完善跳转逻辑

- 为conquerPackage模块添加过渡页面路由并实现页面跳转逻辑
- 新增通用多图上传组件Upload，支持多种模式与图片操作功能
- 新增任务相关的API及Model基础文件
- 注释课前课中页面的测试试题内容

lib/core/components/rich_text_content.dart

@@ -1,4 +1,6 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_screenutil/flutter_screenutil.dart';
+import 'package:flutter_svg/flutter_svg.dart';
 import 'package:flutter_widget_from_html_core/flutter_widget_from_html_core.dart';
 import 'package:new_learn/core/components/audio_player_card.dart';
 import 'package:new_learn/core/components/video_player_view.dart';
@@ -79,13 +81,47 @@ class RichTextContent extends StatelessWidget {
       textStyle: textStyle,
       onTapUrl: onTapUrl ?? _defaultOnTapUrl,
       customStylesBuilder: customStylesBuilder,
-      customWidgetBuilder: _combinedCustomWidget,
+      customWidgetBuilder: _combinedCustomWidget(context),
       renderMode: renderMode,
     );
   }
 
   /// 合并默认替换 + 用户自定义替换
-  CustomWidgetBuilder get _combinedCustomWidget => (element) {
+  CustomWidgetBuilder _combinedCustomWidget(BuildContext context) => (element) {
+        // 内置：<img src="*.svg"> → flutter_svg 行内渲染
+        // core 版 flutter_widget_from_html 不支持 SVG，手动处理
+        if (element.localName == 'img') {
+          final src = element.attributes['src'];
+          if (src != null && src.toLowerCase().endsWith('.svg')) {
+            final width = double.tryParse(element.attributes['width'] ?? '');
+            final height = double.tryParse(element.attributes['height'] ?? '');
+            final w = width != null ? width.w : null;
+            final h = height != null ? height.h : null;
+            // 超采样（SSAA）：SVG 以 3 倍尺寸光栅化再缩回来，消除真机边缘锯齿
+            const scale = 3.0;
+            return InlineCustomWidget(
+              child: SizedBox(
+                width: w,
+                height: h,
+                child: OverflowBox(
+                  maxWidth: w != null ? w * scale : double.infinity,
+                  maxHeight: h != null ? h * scale : double.infinity,
+                  child: Transform.scale(
+                    scale: 1 / scale,
+                    alignment: Alignment.center,
+                    child: SvgPicture.network(
+                      src,
+                      width: w != null ? w * scale : null,
+                      height: h != null ? h * scale : null,
+                      fit: BoxFit.contain,
+                      clipBehavior: Clip.antiAlias,
+                    ),
+                  ),
+                ),
+              ),
+            );
+          }
+        }
         // 内置：<audio> → 本项目 AudioPlayerCard
         if (element.localName == 'audio') {
           final src = element.attributes['src'];