feat: 初始化世界杯观赛助手小程序

- uni-app (Vue3) + Vite 框架
- 7个页面：首页、赛程、比赛详情、球队、球队详情、球员、个人中心
- API 接口配置 (开发/生产环境)
- 状态管理 (Pinia)

src/styles/base.scss

@@ -0,0 +1,120 @@
+page {
+  min-height: 100%;
+  background: #f7f4ea;
+  color: #17211b;
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
+}
+
+view,
+text,
+button,
+input,
+scroll-view {
+  box-sizing: border-box;
+}
+
+button {
+  margin: 0;
+  padding: 0;
+  border: 0;
+  line-height: 1;
+  background: transparent;
+}
+
+button::after {
+  border: 0;
+}
+
+.page {
+  min-height: 100vh;
+  padding: 28rpx;
+  background:
+    linear-gradient(180deg, #f7f4ea 0%, #edf3f2 48%, #f8f7f1 100%);
+}
+
+.nav-title {
+  padding-top: 64rpx;
+  margin-bottom: 28rpx;
+  font-size: 42rpx;
+  font-weight: 800;
+  line-height: 1.15;
+}
+
+.section {
+  margin-top: 30rpx;
+}
+
+.section-head {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  margin-bottom: 18rpx;
+}
+
+.section-title {
+  font-size: 32rpx;
+  font-weight: 800;
+}
+
+.section-action {
+  color: #0b6b53;
+  font-size: 24rpx;
+}
+
+.card {
+  border: 1rpx solid rgba(23, 33, 27, 0.08);
+  border-radius: 8rpx;
+  background: rgba(255, 255, 255, 0.86);
+  box-shadow: 0 12rpx 36rpx rgba(26, 41, 32, 0.08);
+}
+
+.btn-primary,
+.btn-ghost {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  min-height: 72rpx;
+  padding: 0 28rpx;
+  border-radius: 8rpx;
+  font-size: 26rpx;
+  font-weight: 700;
+}
+
+.btn-primary {
+  color: #ffffff;
+  background: #0b6b53;
+}
+
+.btn-ghost {
+  color: #17211b;
+  border: 1rpx solid rgba(23, 33, 27, 0.14);
+  background: #ffffff;
+}
+
+.tag {
+  display: inline-flex;
+  align-items: center;
+  min-height: 40rpx;
+  padding: 0 14rpx;
+  border-radius: 6rpx;
+  color: #5b4323;
+  background: #f2dfad;
+  font-size: 22rpx;
+  font-weight: 700;
+}
+
+.muted {
+  color: #66736d;
+}
+
+.empty {
+  padding: 36rpx 24rpx;
+  color: #66736d;
+  text-align: center;
+  font-size: 26rpx;
+}
+
+.safe-bottom {
+  padding-bottom: calc(32rpx + env(safe-area-inset-bottom));
+}
+