feat(player): 完善 H5 投注端与 API 演示数据

- 球赛/串关/优胜冠军、赛事详情、历史投注与个人资料编辑
- 固定顶栏、公告与底栏，仅内容区滚动
- 底部导航与站点 favicon 使用 logo，登录页精简
- API 种子、冠军盘与历史注单增强

Co-authored-by: Cursor <cursoragent@cursor.com>

packages/shared/public/flags/cn.svg

@@ -0,0 +1,4 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 20">
+  <rect width="30" height="20" fill="#DE2910"/>
+  <polygon fill="#FFDE00" points="7,4 8.2,7.5 12,7.5 8.9,9.7 10.1,13.2 7,11 3.9,13.2 5.1,9.7 2,7.5 5.8,7.5"/>
+</svg>

packages/shared/public/flags/my.svg

@@ -0,0 +1,8 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 20">
+  <rect width="30" height="6.67" fill="#CC0001"/>
+  <rect y="6.67" width="30" height="6.66" fill="#FFF"/>
+  <rect y="13.33" width="30" height="6.67" fill="#CC0001"/>
+  <rect width="15" height="10" fill="#010066"/>
+  <circle cx="7.5" cy="6.5" r="2.8" fill="#FFCC00"/>
+  <circle cx="8.2" cy="6.5" r="2.2" fill="#010066"/>
+</svg>

packages/shared/public/flags/us.svg

@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 20">
+  <rect width="30" height="20" fill="#B22234"/>
+  <path fill="#FFF" d="M0 1.54h30V3.08H0zm0 3.08h30v1.54H0zm0 3.08h30v1.54H0zm0 3.08h30v1.54H0zm0 3.08h30V15.4H0zm0 3.08h30V20H0z"/>
+  <rect width="12" height="10.77" fill="#3C3B6E"/>
+</svg>