feat(my): add 我的考试 page and related modules

1. 新增我的考试页面，包含学科筛选Tab和分页考试列表
2. 新增学科图标工具类，替换我的报告页重复的学科图标逻辑
3. 在我的页面菜单中添加我的考试入口
4. 新增exam模块的API接口和数据模型
5. 优化我的报告页面卡片样式，统一与考试卡片的布局

lib/features/my/my_report/my_report_page.dart

@@ -8,6 +8,7 @@ import 'package:new_learn/core/api/my_report/model.dart';
 import 'package:new_learn/core/components/common_paged_list.dart';
 import 'package:new_learn/core/logger/app_talker.dart';
 import 'package:new_learn/core/utils/img_url.dart';
+import 'package:new_learn/core/utils/subject_icons.dart';
 
 /// ============================================================
 /// 【MyReportPage】我的报告列表 —— 对标 Vue pages/myPackage/myReport/myReport.vue
@@ -25,19 +26,6 @@ import 'package:new_learn/core/utils/img_url.dart';
 /// 四、先只做 phone 布局，Pad 后续再说
 /// ============================================================
 
-/// 学科 icon 映射表（对标 Vue utils/constant.js SUBJECT_ICON_MAP）
-const Map<String, String> _subjectIconMap = {
-  '语文': '/StaticResource/2026-06-11/shuxue1781163770612.png',
-  '化学': '/StaticResource/2026-06-11/huaxue1781163828443.png',
-  '英语': '/StaticResource/2026-06-11/yingyu1781163725441.png',
-  '物理': '/StaticResource/2026-06-11/wuli1781148438346.png',
-  '数学': '/StaticResource/2026-06-11/shuxue1781163770612.png',
-  '生物': '/StaticResource/2026-06-11/shengwu1781163791768.png',
-  '历史': '/StaticResource/2026-06-11/lishi1781163811822.png',
-  '政治': '/StaticResource/2026-06-11/zhengzhi1781163750422.png',
-  '地理': '/StaticResource/2026-06-11/dili1781163844311.png',
-};
-
 /// 取学科名（报告名前 2 个字，对标 Vue getSubjectName）
 String _extractSubjectName(UserReportDto item) {
   final name = item.reportName.trim();
@@ -45,12 +33,6 @@ String _extractSubjectName(UserReportDto item) {
   return name.substring(0, 2);
 }
 
-/// 取学科 icon URL（无匹配则用数学兜底，对标 Vue getSubjectIcon）
-String _getSubjectIconUrl(String subjectName) {
-  final path = _subjectIconMap[subjectName] ?? _subjectIconMap['数学']!;
-  return ImgUrl.build(path);
-}
-
 /// 格式化创建时间（对标 Vue getReportTime）
 String _formatCreateTime(String raw) {
   if (raw.isEmpty) return '';
@@ -120,8 +102,8 @@ class _MyReportPageState extends ConsumerState<MyReportPage> {
         color: const Color(0xFFF5F8FA),
         child: CommonPagedList<UserReportDto>(
           load: _loadPage,
-          padding: EdgeInsets.fromLTRB(12.w, 16.h, 12.w, 0),
-          separatorBuilder: (_, _) => SizedBox(height: 14.h),
+          padding: EdgeInsets.fromLTRB(12.w, 4.h, 12.w, 0),
+          // separatorBuilder: (_, _) => SizedBox(height: 14.h),
           buildItem: (context, item, index) {
             return _ReportCard(item: item, onTap: () => _onTapCard(item));
           },
@@ -140,11 +122,11 @@ class _MyReportPageState extends ConsumerState<MyReportPage> {
 /// ============================================================
 /// 【_ReportCard】报告卡片
 ///
-/// 布局（Row 从左到右）：
-///   [icon + 学科标签]  →  [报告名 + 时间]  →  [箭头]
+/// 左侧装饰与我的考试（exam）卡片一致：
+///   白色圆角卡片 + 左侧溢出书图（book_icon）+ 学科图标叠在书图上 +
+///   底部学科名胶囊。书图/卡片尺寸统一用 .w 锁定宽高比，适配 pad。
 ///
-/// 背景图叠底，InkWell 提供点击水波纹。
-/// 图标/标签自然靠左，不做偏移 hack。
+/// 内容区：中间 [报告名 + 时间]，右侧 [箭头]。
 /// ============================================================
 class _ReportCard extends StatelessWidget {
   const _ReportCard({required this.item, required this.onTap});
@@ -152,115 +134,177 @@ class _ReportCard extends StatelessWidget {
   final UserReportDto item;
   final VoidCallback onTap;
 
+  static const String _cardBgBook =
+      '/StaticResource/2026-09-10/book_icon_final1789026573675.png';
+
+  // 书图标 / 卡片尺寸（与 exam 卡片一致，统一 .w 锁比例）
+  static const double _bookWidth = 124;
+  static const double _bookHeight =
+      124; // 卡片间距 = _bookHeight - _cardHeight（书图向上探出的高度）
+  static const double _cardHeight = 92;
+  static const double _cardRadius = 24;
+  // ⚠ book_icon.png 自带透明 padding，偏移用于补偿留白
+  static const double _bookOffsetLeft = -14;
+  static const double _bookOffsetBottom = -10;
+  static const double _bookExtraHeight = 0;
+
   @override
   Widget build(BuildContext context) {
     final subjectName = _extractSubjectName(item);
-    final subjectIconUrl = _getSubjectIconUrl(subjectName);
+    final iconUrl = subjectIconUrl(subjectName);
     final timeText = _formatCreateTime(item.createTime);
 
-    const bgPath =
-        '/StaticResource/2026-06-10/examListItem_bg1781074465963.png';
-
-    return InkWell(
+    return GestureDetector(
+      behavior: HitTestBehavior.opaque,
       onTap: onTap,
-      borderRadius: BorderRadius.circular(12.r),
-      child: Container(
-        height: 109.h,
-        decoration: BoxDecoration(borderRadius: BorderRadius.circular(12.r)),
+      child: SizedBox(
+        height: (_bookHeight + _bookExtraHeight).w,
         child: Stack(
+          clipBehavior: Clip.none,
           children: [
-            // 底层：卡片背景图
-            Positioned.fill(
-              child: ClipRRect(
-                borderRadius: BorderRadius.circular(12.r),
-                child: CachedNetworkImage(
-                  imageUrl: ImgUrl.build(bgPath),
-                  fit: BoxFit.fill,
-                  placeholder: (_, _) => Container(color: Colors.white),
-                  errorWidget: (_, _, _) => Container(color: Colors.white),
+            // 底层：白色圆角卡片（底部对齐，书图只向上溢出）
+            Positioned(
+              left: 0,
+              right: 0,
+              bottom: 0,
+              child: Container(
+                height: _cardHeight.w,
+                decoration: BoxDecoration(
+                  color: Colors.white,
+                  borderRadius: BorderRadius.circular(_cardRadius.r),
+                  boxShadow: const [
+                    BoxShadow(
+                      color: Color(0x0A1D2B47),
+                      blurRadius: 20,
+                      offset: Offset(0, 6),
+                    ),
+                  ],
                 ),
               ),
             ),
-            // 上层内容：Row 左对齐，padding 控制整体边距
-            Padding(
-              padding: EdgeInsets.symmetric(horizontal: 22.w),
+            // 中层：左侧书形装饰图
+            Positioned(
+              left: _bookOffsetLeft.w,
+              bottom: _bookOffsetBottom.w,
+              width: _bookWidth.w,
+              height: (_bookHeight + _bookExtraHeight).w,
+              child: CachedNetworkImage(
+                imageUrl: ImgUrl.build(_cardBgBook),
+                fit: BoxFit.contain,
+                alignment: Alignment.bottomLeft,
+                errorWidget: (_, __, ___) =>
+                    SizedBox(width: _bookWidth.w, height: _bookHeight.w),
+              ),
+            ),
+            // 学科小图标（叠在书图上半部分）
+            Positioned(
+              left: 22.w,
+              top: 14.w,
+              child: CachedNetworkImage(
+                imageUrl: iconUrl,
+                width: 56.w,
+                height: 56.w,
+                errorWidget: (_, _, _) => Icon(
+                  Icons.menu_book,
+                  size: 56.w,
+                  color: const Color(0xFF3D7DF5),
+                ),
+              ),
+            ),
+            // 上层：内容（与卡片同高，底部对齐）
+            Positioned(
+              left: 0,
+              right: 0,
+              bottom: 0,
+              height: _cardHeight.w,
               child: Row(
-                crossAxisAlignment: CrossAxisAlignment.center,
                 children: [
-                  // ── 左侧：学科 icon + 标签（垂直排列，自然靠左） ──
-                  Column(
-                    mainAxisSize: MainAxisSize.min,
-                    children: [
-                      CachedNetworkImage(
-                        imageUrl: subjectIconUrl,
-                        width: 56.w,
-                        height: 56.w,
-                        placeholder: (_, _) => const SizedBox.shrink(),
-                        errorWidget: (_, _, _) => const SizedBox.shrink(),
-                      ),
-                      SizedBox(height: 4.h),
-                      Container(
-                        padding: EdgeInsets.symmetric(horizontal: 8.w),
-                        height: 25.h,
-                        decoration: BoxDecoration(
-                          color: const Color(0xFFEAF5FE),
-                          borderRadius: BorderRadius.circular(7.r),
-                        ),
-                        alignment: Alignment.center,
-                        child: Text(
-                          subjectName,
-                          style: TextStyle(
-                            fontSize: 14.sp,
-                            color: const Color(0xFF3D7DF5),
-                          ),
-                        ),
-                      ),
-                    ],
-                  ),
-                  SizedBox(width: 40.w),
-                  // ── 中间：报告名 + 时间（Expanded 占剩余） ──
+                  // 左侧书图区域占位
+                  SizedBox(width: 90.w),
                   Expanded(
-                    child: Column(
-                      crossAxisAlignment: CrossAxisAlignment.start,
-                      mainAxisAlignment: MainAxisAlignment.center,
-                      children: [
-                        SizedBox(height: 10.h),
-                        Text(
-                          item.reportName,
-                          maxLines: 1,
-                          overflow: TextOverflow.ellipsis,
-                          style: TextStyle(
-                            fontWeight: FontWeight.w500,
-                            fontSize: 16.sp,
-                            color: const Color(0xFF1D2B47),
-                          ),
-                        ),
-                        SizedBox(height: 20.h),
-                        Text(
-                          timeText,
-                          style: TextStyle(
-                            fontSize: 12.sp,
-                            color: const Color(0xFF687FAD),
-                          ),
-                        ),
-                      ],
-                    ),
-                  ),
-                  // ── 右侧：箭头 ──
-                  Padding(
-                    padding: EdgeInsets.only(top: 10.h),
-                    child: Icon(
-                      Icons.chevron_right,
-                      color: const Color(0xFF4B6B99),
-                      size: 22.sp,
+                    child: Padding(
+                      padding: EdgeInsets.symmetric(horizontal: 12.w),
+                      child: Row(
+                        children: [
+                          Expanded(child: _buildMid(timeText)),
+                          _buildRight(),
+                        ],
+                      ),
                     ),
                   ),
                 ],
               ),
             ),
+            // 学科标签（覆盖在书图底部胶囊上，卡片贴底）
+            Positioned(
+              left: -10.w,
+              bottom: 10.w,
+              width: _bookWidth.w,
+              child: Center(
+                child: Container(
+                  padding: EdgeInsets.symmetric(
+                    horizontal: 14.w,
+                    vertical: 6.w,
+                  ),
+                  decoration: BoxDecoration(
+                    color: const Color(0xFFE8F2FF),
+                    borderRadius: BorderRadius.circular(12.r),
+                  ),
+                  child: Text(
+                    subjectName,
+                    style: TextStyle(
+                      fontSize: 16.spMin,
+                      fontWeight: FontWeight.w600,
+                      color: const Color(0xFF3D7DF5),
+                      height: 1.2,
+                    ),
+                  ),
+                ),
+              ),
+            ),
           ],
         ),
       ),
     );
   }
+
+  // 中间：报告名 + 时间
+  Widget _buildMid(String timeText) {
+    return Column(
+      mainAxisAlignment: MainAxisAlignment.center,
+      crossAxisAlignment: CrossAxisAlignment.start,
+      children: [
+        Text(
+          item.reportName,
+          maxLines: 1,
+          overflow: TextOverflow.ellipsis,
+          style: TextStyle(
+            fontSize: 18.spMin,
+            fontWeight: FontWeight.w600,
+            color: const Color(0xFF1D2B47),
+          ),
+        ),
+        SizedBox(height: 8.h),
+        Text(
+          timeText,
+          maxLines: 1,
+          overflow: TextOverflow.ellipsis,
+          style: TextStyle(
+            fontSize: 14.spMin,
+            fontWeight: FontWeight.w400,
+            color: const Color(0xFF687FAD),
+          ),
+        ),
+      ],
+    );
+  }
+
+  // 右侧：箭头
+  Widget _buildRight() {
+    return Icon(
+      Icons.chevron_right,
+      color: const Color(0xFF4B6B99),
+      size: 22.sp,
+    );
+  }
 }