增加尖峰平谷找平功能，修改消息提示

public/static/css/style.css

@@ -1106,6 +1106,118 @@ color: #666;
     flex-shrink: 0;
 }
 
+/* ============== Toast 消息提示 ============== */
+.toast-container {
+    position: fixed;
+    top: 20px;
+    right: 20px;
+    z-index: 10000;
+    display: flex;
+    flex-direction: column;
+    gap: 10px;
+    pointer-events: none;
+    max-width: 400px;
+}
+
+.toast {
+    display: flex;
+    align-items: flex-start;
+    gap: 10px;
+    padding: 12px 16px;
+    border-radius: 8px;
+    background: #fff;
+    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
+    border-left: 4px solid #909399;
+    font-size: 14px;
+    line-height: 1.5;
+    color: #333;
+    pointer-events: auto;
+    animation: toast-slide-in 0.3s ease;
+    word-break: break-word;
+}
+
+.toast.toast-success {
+    border-left-color: #67c23a;
+    background: #f0f9eb;
+}
+
+.toast.toast-error {
+    border-left-color: #f56c6c;
+    background: #fef0f0;
+}
+
+.toast.toast-warning {
+    border-left-color: #e6a23c;
+    background: #fdf6ec;
+}
+
+.toast.toast-info {
+    border-left-color: #409eff;
+    background: #ecf5ff;
+}
+
+.toast-icon {
+    flex-shrink: 0;
+    width: 20px;
+    height: 20px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    font-size: 16px;
+    font-weight: bold;
+}
+
+.toast.toast-success .toast-icon { color: #67c23a; }
+.toast.toast-error .toast-icon { color: #f56c6c; }
+.toast.toast-warning .toast-icon { color: #e6a23c; }
+.toast.toast-info .toast-icon { color: #409eff; }
+
+.toast-content {
+    flex: 1;
+    min-width: 0;
+}
+
+.toast-close {
+    flex-shrink: 0;
+    background: none;
+    border: none;
+    color: #c0c4cc;
+    cursor: pointer;
+    font-size: 16px;
+    padding: 0;
+    line-height: 1;
+}
+
+.toast-close:hover {
+    color: #909399;
+}
+
+.toast.toast-fade-out {
+    animation: toast-slide-out 0.3s ease forwards;
+}
+
+@keyframes toast-slide-in {
+    from {
+        opacity: 0;
+        transform: translateX(100%);
+    }
+    to {
+        opacity: 1;
+        transform: translateX(0);
+    }
+}
+
+@keyframes toast-slide-out {
+    from {
+        opacity: 1;
+        transform: translateX(0);
+    }
+    to {
+        opacity: 0;
+        transform: translateX(100%);
+    }
+}
+
 .generate-item.running .generate-item-status {
     color: #17a2b8;
 }