feat(report): 重构统计报告，增加效率分析并采用MD3设计

本次更新对统计报告进行了全面的重构和视觉升级，旨在提供更深入的数据洞察和更现代化的用户体验。

主要变更包括：
- **新增效率分析模块**: 引入了一系列关键的大模型效率指标，如单条消息成本、Token效率（输出/输入比）、每小时成本/请求数等，并通过新的表格进行详细展示。
- **全新UI设计**: 整体界面采用Material Design 3 (MD3) 风格重新设计，优化了色彩、字体、间距和卡片样式，提升了报告的专业性和可读性。
- **图表功能增强**: 动态图表和静态图表均进行了美化，更新了配色方案，增加了平滑的加载动画和交互效果。饼图升级为更易读的甜甜圈图，并优化了工具提示信息。
- **内容和布局优化**: 增加了更多的摘要卡片以快速概览核心数据。为各个板块标题添加了 Emoji 图标，使信息层次更清晰，并优化了整体布局。

src/chat/utils/templates/report.css

@@ -1,111 +1,164 @@
+/* Material Design 3 - Blue White Gray Theme */
+:root {
+    --md-sys-color-primary: #1976D2;
+    --md-sys-color-primary-container: #E3F2FD;
+    --md-sys-color-on-primary: #FFFFFF;
+    --md-sys-color-secondary: #546E7A;
+    --md-sys-color-secondary-container: #ECEFF1;
+    --md-sys-color-surface: #FFFFFF;
+    --md-sys-color-surface-variant: #F5F5F5;
+    --md-sys-color-background: #FAFAFA;
+    --md-sys-color-on-surface: #1C1B1F;
+    --md-sys-color-outline: #BDBDBD;
+    --md-sys-color-shadow: rgba(0, 0, 0, 0.1);
+}
+
 /* General Body Styles */
 body {
-    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
+    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
     margin: 0;
     padding: 20px;
-    background-color: #f0f4f8; /* Light blue-gray background */
-    color: #333; /* Darker text for better contrast */
+    background: var(--md-sys-color-background);
+    color: var(--md-sys-color-on-surface);
     line-height: 1.6;
+    min-height: 100vh;
 }
 
 /* Main Container */
 .container {
-    max-width: 95%; /* Make container almost full-width */
+    max-width: 95%;
     margin: 20px auto;
-    background-color: #FFFFFF; /* Pure white background */
-    padding: 30px;
-    border-radius: 12px; /* Slightly more rounded corners */
-    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.07); /* Softer, deeper shadow */
+    background-color: var(--md-sys-color-surface);
+    padding: 40px;
+    border-radius: 28px;
+    box-shadow: 0 4px 16px var(--md-sys-color-shadow);
+    animation: slideIn 0.3s cubic-bezier(0.4, 0, 0.2, 1);
+}
+
+@keyframes slideIn {
+    from {
+        opacity: 0;
+        transform: translateY(-8px);
+    }
+    to {
+        opacity: 1;
+        transform: translateY(0);
+    }
 }
 /* Dashboard Layout */
 .dashboard-layout {
     display: flex;
-    gap: 30px;
+    flex-direction: column;
+    gap: 32px;
 }
 
 .main-content {
-    flex: 65%;
+    width: 100%;
     min-width: 0;
 }
 
 .sidebar-content {
-    flex: 35%;
+    width: 100%;
     min-width: 0;
 }
 
-/* Responsive Design for Mobile */
-@media (max-width: 992px) {
-    .dashboard-layout {
-        flex-direction: column;
-    }
-    .main-content, .sidebar-content {
-        flex: 1;
-    }
-}
-
-/* Typography */
+/* Typography - Material Design 3 */
 h1, h2 {
-    color: #212529;
+    color: var(--md-sys-color-on-surface);
     padding-bottom: 10px;
     margin-top: 0;
 }
 
 h1 {
     text-align: center;
-    font-size: 2.2em;
-    margin-bottom: 20px;
-    color: #2A6CB5; /* A deeper, more professional blue */
+    font-size: 2.5em;
+    margin-bottom: 30px;
+    color: var(--md-sys-color-primary);
+    font-weight: 500;
+    letter-spacing: 0;
 }
 
 h2 {
     font-size: 1.5em;
     margin-top: 40px;
-    margin-bottom: 15px;
-    border-bottom: 2px solid #DDE6ED; /* Lighter border color */
+    margin-bottom: 20px;
+    border-bottom: 2px solid var(--md-sys-color-primary);
+    padding-bottom: 12px;
+    color: var(--md-sys-color-on-surface);
+    font-weight: 500;
+    display: flex;
+    align-items: center;
+    gap: 8px;
 }
 
-/* Info Banners */
+/* Info Banners - MD3 Style */
 .info-item {
-    background-color: #E9F2FA; /* Light blue background */
-    padding: 12px 18px;
-    border-radius: 8px;
-    margin-bottom: 20px;
+    background: var(--md-sys-color-primary-container);
+    padding: 16px 24px;
+    border-radius: 16px;
+    margin-bottom: 24px;
     font-size: 0.95em;
-    border: 1px solid #D1E3F4; /* Light blue border */
+    border-left: 4px solid var(--md-sys-color-primary);
+    box-shadow: 0 1px 3px var(--md-sys-color-shadow);
+    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
+}
+
+.info-item:hover {
+    box-shadow: 0 2px 6px var(--md-sys-color-shadow);
 }
 
 .info-item strong {
-    color: #2A6CB5; /* Deeper blue for emphasis */
+    color: var(--md-sys-color-primary);
+    font-weight: 500;
 }
 
-/* Tabs */
+/* Tabs - MD3 Style */
 .tabs {
-    border-bottom: 2px solid #DEE2E6;
+    border-bottom: 1px solid var(--md-sys-color-outline);
     display: flex;
-    margin-bottom: 20px;
+    margin-bottom: 32px;
+    flex-wrap: wrap;
+    gap: 8px;
 }
 
 .tabs button {
     background: none;
     border: none;
     outline: none;
-    padding: 14px 20px;
+    padding: 16px 24px;
     cursor: pointer;
-    transition: all 0.3s ease;
-    font-size: 16px;
-    color: #6C757D;
-    border-bottom: 3px solid transparent;
-    margin-bottom: -2px; /* Align with container border */
+    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
+    font-size: 14px;
+    color: var(--md-sys-color-on-surface);
+    border-radius: 16px 16px 0 0;
+    margin-bottom: -1px;
+    font-weight: 500;
+    position: relative;
+}
+
+.tabs button::after {
+    content: '';
+    position: absolute;
+    bottom: 0;
+    left: 0;
+    right: 0;
+    height: 3px;
+    background: var(--md-sys-color-primary);
+    transform: scaleX(0);
+    transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
 }
 
 .tabs button:hover {
-    color: #2A6CB5;
-    background-color: #f0f4f8; /* Subtle hover background */
+    background: var(--md-sys-color-surface-variant);
 }
 
 .tabs button.active {
-    color: #2A6CB5; /* Active tab color */
-    border-bottom-color: #2A6CB5; /* Active tab border color */
+    color: var(--md-sys-color-primary);
+    font-weight: 600;
+}
+
+.tabs button.active::after {
+    transform: scaleX(1);
 }
 
 .tab-content {
@@ -117,83 +170,277 @@ h2 {
     display: block;
 }
 
-/* Summary Cards */
+/* Summary Cards - MD3 Style */
 .summary-cards {
     display: grid;
-    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
-    gap: 20px;
-    margin: 20px 0;
+    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
+    gap: 16px;
+    margin: 32px 0;
 }
 
 .card {
-    background-color: #FFFFFF;
-    padding: 20px;
-    border-radius: 8px;
+    background: var(--md-sys-color-surface);
+    padding: 24px;
+    border-radius: 16px;
     text-align: center;
-    border: 1px solid #DDE6ED; /* Lighter border */
-    transition: all 0.3s ease;
+    border: 1px solid var(--md-sys-color-outline);
+    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
+    box-shadow: 0 1px 3px var(--md-sys-color-shadow);
 }
 
 .card:hover {
-    transform: translateY(-5px);
-    box-shadow: 0 6px 15px rgba(0,0,0,0.08);
+    box-shadow: 0 4px 12px var(--md-sys-color-shadow);
+    transform: translateY(-4px);
+    border-color: var(--md-sys-color-primary);
 }
 
 .card h3 {
-    margin: 0 0 10px;
-    font-size: 1em;
-    color: #6C757D;
+    margin: 0 0 16px;
+    font-size: 0.875rem;
+    color: var(--md-sys-color-secondary);
+    font-weight: 500;
+    letter-spacing: 0.1px;
 }
 
 .card p {
     margin: 0;
-    font-size: 1.8em;
-    font-weight: bold;
-    color: #212529;
+    font-size: 2rem;
+    font-weight: 600;
+    color: var(--md-sys-color-primary);
+    line-height: 1.2;
 }
 
-/* Tables */
+/* Tables - MD3 Style */
 table {
     width: 100%;
     border-collapse: collapse;
-    margin-top: 15px;
-    font-size: 0.9em;
+    margin-top: 24px;
+    font-size: 0.875rem;
+    border-radius: 16px;
+    overflow: hidden;
+    box-shadow: 0 1px 3px var(--md-sys-color-shadow);
+    border: 1px solid var(--md-sys-color-outline);
 }
 
 th, td {
-    padding: 12px 15px;
+    padding: 16px;
     text-align: left;
-    border-bottom: 1px solid #EAEAEA;
+    border-bottom: 1px solid var(--md-sys-color-outline);
 }
+
 th {
-    background-color: #4A90E2; /* Main theme blue */
-    color: white;
-    font-weight: bold;
-    font-size: 0.95em;
-    text-transform: uppercase;
-    letter-spacing: 0.5px;
+    background: var(--md-sys-color-primary);
+    color: var(--md-sys-color-on-primary);
+    font-weight: 500;
+    font-size: 0.875rem;
+    letter-spacing: 0.1px;
+}
+
+tbody tr {
+    transition: background-color 0.2s cubic-bezier(0.4, 0, 0.2, 1);
 }
 
 tr:nth-child(even) {
-    background-color: #F7FAFC; /* Very light blue for alternate rows */
+    background-color: var(--md-sys-color-surface-variant);
 }
 
-tr:hover {
-    background-color: #E9F2FA; /* Light blue for hover */
+tbody tr:hover {
+    background-color: var(--md-sys-color-primary-container);
 }
 
-/* Chart Container in Sidebar */
+/* Chart Container - MD3 Style */
 .chart-container {
     position: relative;
-    height: 300px; /* Adjust height as needed */
     width: 100%;
-    margin-bottom: 20px;
+    padding: 24px;
+    background: var(--md-sys-color-surface);
+    border-radius: 16px;
+    box-shadow: 0 1px 3px var(--md-sys-color-shadow);
+    border: 1px solid var(--md-sys-color-outline);
+    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
 }
 
-/* Footer */
+.chart-container:hover {
+    box-shadow: 0 4px 12px var(--md-sys-color-shadow);
+}
+
+.chart-container canvas {
+    max-width: 100%;
+    height: auto !important;
+}
+
+/* Chart Wrapper for dynamic charts */
+.chart-wrapper {
+    position: relative;
+    width: 100%;
+    height: 350px;
+    padding: 24px;
+    background: var(--md-sys-color-surface);
+    border-radius: 16px;
+    box-shadow: 0 1px 3px var(--md-sys-color-shadow);
+    border: 1px solid var(--md-sys-color-outline);
+}
+
+.chart-wrapper canvas {
+    max-height: 300px !important;
+}
+
+.chart-grid {
+    display: flex;
+    flex-direction: column;
+    gap: 24px;
+    margin-top: 24px;
+}
+
+/* Time Range Buttons - MD3 Filled Button */
+.time-range-btn {
+    background: var(--md-sys-color-primary);
+    color: var(--md-sys-color-on-primary);
+    border: none;
+    padding: 10px 24px;
+    margin: 0 8px;
+    border-radius: 20px;
+    cursor: pointer;
+    font-size: 14px;
+    font-weight: 500;
+    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
+    box-shadow: 0 1px 3px var(--md-sys-color-shadow);
+}
+
+.time-range-btn:hover {
+    box-shadow: 0 2px 6px var(--md-sys-color-shadow);
+}
+
+.time-range-btn.active {
+    background: var(--md-sys-color-secondary);
+    box-shadow: 0 2px 6px var(--md-sys-color-shadow);
+}
+
+/* Statistics Badge - MD3 */
+.stat-badge {
+    display: inline-block;
+    padding: 4px 12px;
+    background: var(--md-sys-color-primary-container);
+    color: var(--md-sys-color-primary);
+    border-radius: 16px;
+    font-size: 0.875rem;
+    font-weight: 500;
+    margin-left: 8px;
+}
+
+/* Loading Animation */
+@keyframes pulse {
+    0%, 100% {
+        opacity: 1;
+    }
+    50% {
+        opacity: 0.5;
+    }
+}
+
+.loading {
+    animation: pulse 1.5s ease-in-out infinite;
+}
+
+/* Scrollbar Styling - MD3 */
+::-webkit-scrollbar {
+    width: 12px;
+    height: 12px;
+}
+
+::-webkit-scrollbar-track {
+    background: var(--md-sys-color-surface-variant);
+    border-radius: 8px;
+}
+
+::-webkit-scrollbar-thumb {
+    background: var(--md-sys-color-primary);
+    border-radius: 8px;
+    border: 2px solid var(--md-sys-color-surface-variant);
+}
+
+::-webkit-scrollbar-thumb:hover {
+    background: var(--md-sys-color-secondary);
+}
+
+/* Footer - MD3 */
 .footer {
     text-align: center;
-    margin-top: 40px;
-    font-size: 0.85em;
-    color: #6C757D;
+    margin-top: 48px;
+    padding-top: 24px;
+    border-top: 1px solid var(--md-sys-color-outline);
+    font-size: 0.875rem;
+    color: var(--md-sys-color-secondary);
+}
+
+.footer p {
+    margin: 8px 0;
+}
+
+/* Responsive Design */
+@media (max-width: 768px) {
+    .container {
+        padding: 20px;
+        border-radius: 16px;
+    }
+    
+    h1 {
+        font-size: 2em;
+    }
+    
+    h2 {
+        font-size: 1.25em;
+    }
+    
+    .summary-cards {
+        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
+        gap: 12px;
+    }
+    
+    .card {
+        padding: 16px;
+    }
+    
+    .card h3 {
+        font-size: 0.8rem;
+        margin-bottom: 12px;
+    }
+    
+    .card p {
+        font-size: 1.5rem;
+    }
+    
+    table {
+        font-size: 0.8rem;
+    }
+    
+    th, td {
+        padding: 12px 8px;
+    }
+    
+    .tabs button {
+        padding: 12px 16px;
+        font-size: 13px;
+    }
+    
+    .time-range-btn {
+        padding: 8px 16px;
+        margin: 4px;
+        font-size: 13px;
+    }
+    
+    .chart-wrapper,
+    .chart-container {
+        height: 250px;
+    }
+}
+
+@media (max-width: 480px) {
+    .summary-cards {
+        grid-template-columns: 1fr 1fr;
+    }
+    
+    .card p {
+        font-size: 1.25rem;
+    }
 }