feat: basic layout and pages

- add basic layout with sidebar and main container
- add three menus in sidebar
- add people form page for post people
- add text and image input for recognize people info
- add people table page for show peoples

src/styles/layout.css

@@ -0,0 +1,54 @@
+/* 布局相关样式 */
+.layout-wrapper {
+  min-height: 100vh;
+}
+
+/* 侧栏头部区域 */
+.sider-header {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  padding: 20px 16px 12px 16px;
+  color: #e5e7eb;
+}
+.sider-title {
+  font-weight: 600;
+  font-size: 16px;
+}
+.sider-desc {
+  font-size: 12px;
+  color: #a3a3a3;
+}
+
+/* 主内容区 */
+.main-content {
+  display: flex;
+  flex-direction: column;
+  height: 100%;
+}
+.content-body {
+  flex: 1;
+  padding: 32px;
+}
+
+/* 输入面板固定底部 */
+.input-panel-wrapper {
+  position: sticky;
+  bottom: 0;
+  background: linear-gradient(180deg, rgba(15, 23, 42, 0.5) 0%, rgba(15, 23, 42, 0.9) 40%, rgba(15, 23, 42, 1) 100%);
+  backdrop-filter: blur(4px);
+  border-top: 1px solid rgba(255,255,255,0.08);
+  padding: 16px 24px 24px 24px;
+}
+
+.hint-text {
+  margin-top: 10px;
+  font-size: 12px;
+  color: #9ca3af;
+}
+
+/* 小屏优化：输入区域内边距更紧凑 */
+@media (max-width: 768px) {
+  .content-body { padding: 16px; }
+  .input-panel-wrapper { padding: 12px 12px 16px 12px; }
+}