feat(miniprogram): 通用组件 + 页面接入 — Chunk 7

- 创建 EmptyState/ErrorState/Loading 三个通用组件
- 8个列表页面接入通用组件替换内联空状态/loading
- app.config.ts 添加 login 页面路由

apps/miniprogram/src/components/EmptyState/index.scss

@@ -0,0 +1,37 @@
+@import '../../styles/variables.scss';
+
+.empty-state {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  padding: 120px 40px;
+}
+
+.empty-state-icon {
+  font-size: 80px;
+  margin-bottom: 24px;
+}
+
+.empty-state-text {
+  font-size: 30px;
+  color: $tx2;
+  margin-bottom: 8px;
+}
+
+.empty-state-hint {
+  font-size: 24px;
+  color: $tx3;
+  margin-bottom: 32px;
+}
+
+.empty-state-action {
+  background: $pri;
+  border-radius: 40px;
+  padding: 16px 48px;
+}
+
+.empty-state-action-text {
+  font-size: 28px;
+  color: #fff;
+}