feat: 电子药箱小程序 - 4Tab药品管理

- 电子药箱: 药品库存管理 + 手动录入 + 今日用药打卡
- 药品百科: 搜索 + 分类筛选 + 20种药品静态数据
- 惠教中心: 4条药品使用指南课程
- 我的: 家庭成员信息管理
- 自定义TabBar + navigation-bar组件
- SVG药品分类插图

miniprogram/pages/tab-bar/medicine-box/add/index.scss

@@ -0,0 +1,67 @@
+.page {
+  min-height: 100vh;
+  background: #f5f5f5;
+  padding: 20rpx 30rpx 60rpx;
+  box-sizing: border-box;
+  overflow-x: hidden;
+}
+
+.form-section {
+  background: #ffffff; border-radius: 24rpx; padding: 30rpx;
+  box-shadow: 0 2rpx 16rpx rgba(0, 0, 0, 0.04);
+}
+
+.form-group { margin-bottom: 30rpx; }
+.form-label { font-size: 28rpx; font-weight: 600; color: #333; margin-bottom: 14rpx; }
+.required { color: #FF3B30; }
+
+.form-input {
+  width: 100%; height: 80rpx; background: #f7f8fa;
+  border-radius: 14rpx; padding: 0 24rpx; font-size: 28rpx; box-sizing: border-box;
+}
+
+.form-picker {
+  display: flex; align-items: center; justify-content: space-between;
+  width: 100%; height: 80rpx; background: #f7f8fa;
+  border-radius: 14rpx; padding: 0 24rpx; font-size: 28rpx;
+  box-sizing: border-box; color: #333;
+}
+
+.form-picker.placeholder { color: #bbb; }
+.picker-arrow { font-size: 22rpx; color: #999; }
+
+.form-textarea {
+  width: 100%; height: 140rpx; background: #f7f8fa;
+  border-radius: 14rpx; padding: 20rpx 24rpx; font-size: 28rpx; box-sizing: border-box;
+}
+
+.form-row { display: flex; gap: 20rpx; }
+.form-row .half { flex: 1; }
+
+.slot-group { display: flex; gap: 16rpx; }
+
+.slot-chip {
+  flex: 1; text-align: center; height: 72rpx; line-height: 72rpx;
+  background: #f7f8fa; border-radius: 14rpx; font-size: 26rpx;
+  color: #666; border: 2rpx solid transparent;
+}
+
+.slot-chip.active {
+  background: #e8f8ee; color: #07C160;
+  border-color: #07C160; font-weight: 600;
+}
+
+.btn-area { margin-top: 40rpx; }
+
+.save-btn {
+  width: 100%; height: 90rpx; line-height: 90rpx;
+  background: linear-gradient(135deg, #07C160, #06AD56);
+  color: #fff; font-size: 32rpx; font-weight: 600;
+  border-radius: 18rpx; border: none; margin-bottom: 20rpx;
+}
+
+.cancel-btn {
+  width: 100%; height: 90rpx; line-height: 90rpx;
+  background: #fff; color: #FF3B30; font-size: 32rpx;
+  border-radius: 18rpx; border: 2rpx solid #FF3B30;
+}