feat(task1): restructure directories for turborepo monorepo

- Move backend/ to apps/server/ via git mv
- Move frontend/ to apps/admin/ via git mv
- Create packages/typescript-config/ with base, nestjs, and react-vite presets

apps/admin/src/index.css

@@ -0,0 +1,47 @@
+* {
+  margin: 0;
+  padding: 0;
+  box-sizing: border-box;
+}
+
+body {
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+#root {
+  min-height: 100vh;
+}
+
+/* 移动端自适应 */
+@media (max-width: 767px) {
+  .ant-table {
+    font-size: 13px;
+  }
+  .ant-table-cell {
+    padding: 8px 6px !important;
+  }
+  .ant-descriptions-item-label,
+  .ant-descriptions-item-content {
+    font-size: 13px;
+  }
+  .ant-modal {
+    max-width: calc(100vw - 24px) !important;
+    margin: 12px auto !important;
+  }
+  .ant-modal .ant-modal-body {
+    max-height: 60vh;
+    overflow-y: auto;
+  }
+  h2 {
+    font-size: 18px !important;
+  }
+  .ant-card {
+    margin-bottom: 8px;
+  }
+  .ant-space-item .ant-btn {
+    padding: 2px 6px;
+    font-size: 12px;
+  }
+}