新增前后端AI聊天模块，包括流式对话、配置管理和UI组件优化。

frontend/src/style/animations.css

@@ -0,0 +1,81 @@
+@keyframes fadeInUp {
+  from {
+    opacity: 0;
+    transform: translateY(20px);
+  }
+  to {
+    opacity: 1;
+    transform: translateY(0);
+  }
+}
+
+@keyframes fadeIn {
+  from { opacity: 0; }
+  to { opacity: 1; }
+}
+
+@keyframes slideInRight {
+  from {
+    opacity: 0;
+    transform: translateX(30px);
+  }
+  to {
+    opacity: 1;
+    transform: translateX(0);
+  }
+}
+
+@keyframes slideOutRight {
+  from {
+    opacity: 1;
+    transform: translateX(0);
+  }
+  to {
+    opacity: 0;
+    transform: translateX(30px);
+  }
+}
+
+@keyframes scaleIn {
+  from {
+    opacity: 0;
+    transform: scale(0.95);
+  }
+  to {
+    opacity: 1;
+    transform: scale(1);
+  }
+}
+
+@keyframes inkSpread {
+  from {
+    transform: scaleX(0);
+  }
+  to {
+    transform: scaleX(1);
+  }
+}
+
+@keyframes shimmer {
+  0% { background-position: -200% 0; }
+  100% { background-position: 200% 0; }
+}
+
+/* 笔画描边动画 */
+@keyframes strokeDraw {
+  from {
+    stroke-dashoffset: 1;
+  }
+  to {
+    stroke-dashoffset: 0;
+  }
+}
+
+/* 页面转场 */
+.page-enter-active {
+  animation: fadeInUp var(--duration-normal) var(--ease-out-smooth) both;
+}
+
+.page-leave-active {
+  animation: fadeIn var(--duration-fast) ease reverse both;
+}