feat: 新增7种简约纯色表格风格

新增风格：
- slate 石板灰：专业商务
- sky 天空蓝：清爽明亮
- rose 玫瑰红：优雅大方
- amber 琥珀黄：温暖柔和
- emerald 翡翠绿：高贵典雅
- indigo 靛蓝色：沉稳内敛
- stone 石灰白：极简现代

特点：纯色表头，简洁干净，无渐变效果

index.html

@@ -81,6 +81,13 @@ C, 20, 30, 40</pre>
                             <option value="gold">金色</option>
                             <option value="coral">珊瑚</option>
                             <option value="mint">薄荷</option>
+                            <option value="slate">石板灰</option>
+                            <option value="sky">天空蓝</option>
+                            <option value="rose">玫瑰红</option>
+                            <option value="amber">琥珀黄</option>
+                            <option value="emerald">翡翠绿</option>
+                            <option value="indigo">靛蓝色</option>
+                            <option value="stone">石灰白</option>
                         </select>
                     </div>
 
@@ -123,6 +130,13 @@ C, 20, 30, 40</pre>
                             <option value="gold">金色</option>
                             <option value="coral">珊瑚</option>
                             <option value="mint">薄荷</option>
+                            <option value="slate">石板灰</option>
+                            <option value="sky">天空蓝</option>
+                            <option value="rose">玫瑰红</option>
+                            <option value="amber">琥珀黄</option>
+                            <option value="emerald">翡翠绿</option>
+                            <option value="indigo">靛蓝色</option>
+                            <option value="stone">石灰白</option>
                         </select>
                     </div>
 
@@ -260,6 +274,34 @@ C, 20, 30, 40</pre>
                             <span class="theme-preview" style="background: linear-gradient(135deg, #00bfa5, #80cbc4)"></span>
                             <span class="theme-name">薄荷</span>
                         </button>
+                        <button class="theme-btn" data-theme="slate" onclick="quickSwitchTheme('slate')">
+                            <span class="theme-preview" style="background: #475569"></span>
+                            <span class="theme-name">石板灰</span>
+                        </button>
+                        <button class="theme-btn" data-theme="sky" onclick="quickSwitchTheme('sky')">
+                            <span class="theme-preview" style="background: #0ea5e9"></span>
+                            <span class="theme-name">天空蓝</span>
+                        </button>
+                        <button class="theme-btn" data-theme="rose" onclick="quickSwitchTheme('rose')">
+                            <span class="theme-preview" style="background: #e11d48"></span>
+                            <span class="theme-name">玫瑰红</span>
+                        </button>
+                        <button class="theme-btn" data-theme="amber" onclick="quickSwitchTheme('amber')">
+                            <span class="theme-preview" style="background: #f59e0b"></span>
+                            <span class="theme-name">琥珀黄</span>
+                        </button>
+                        <button class="theme-btn" data-theme="emerald" onclick="quickSwitchTheme('emerald')">
+                            <span class="theme-preview" style="background: #10b981"></span>
+                            <span class="theme-name">翡翠绿</span>
+                        </button>
+                        <button class="theme-btn" data-theme="indigo" onclick="quickSwitchTheme('indigo')">
+                            <span class="theme-preview" style="background: #6366f1"></span>
+                            <span class="theme-name">靛蓝色</span>
+                        </button>
+                        <button class="theme-btn" data-theme="stone" onclick="quickSwitchTheme('stone')">
+                            <span class="theme-preview" style="background: #78716c"></span>
+                            <span class="theme-name">石灰白</span>
+                        </button>
                     </div>
                 </div>
             </div>

server.js

@@ -570,6 +570,70 @@ const tableThemes = {
         borderColor: '#80cbc4',
         stripeColor: '#e0f2f1',
         titleColor: '#004d40'
+    },
+    // 简约纯色风格
+    slate: {
+        bgColor: '#ffffff',
+        headerBg: '#475569',
+        headerColor: '#ffffff',
+        cellColor: '#334155',
+        borderColor: '#cbd5e1',
+        stripeColor: '#f8fafc',
+        titleColor: '#1e293b'
+    },
+    sky: {
+        bgColor: '#ffffff',
+        headerBg: '#0ea5e9',
+        headerColor: '#ffffff',
+        cellColor: '#0c4a6e',
+        borderColor: '#bae6fd',
+        stripeColor: '#f0f9ff',
+        titleColor: '#0c4a6e'
+    },
+    rose: {
+        bgColor: '#ffffff',
+        headerBg: '#e11d48',
+        headerColor: '#ffffff',
+        cellColor: '#881337',
+        borderColor: '#fecdd3',
+        stripeColor: '#fff1f2',
+        titleColor: '#881337'
+    },
+    amber: {
+        bgColor: '#ffffff',
+        headerBg: '#f59e0b',
+        headerColor: '#ffffff',
+        cellColor: '#78350f',
+        borderColor: '#fde68a',
+        stripeColor: '#fffbeb',
+        titleColor: '#78350f'
+    },
+    emerald: {
+        bgColor: '#ffffff',
+        headerBg: '#10b981',
+        headerColor: '#ffffff',
+        cellColor: '#064e3b',
+        borderColor: '#a7f3d0',
+        stripeColor: '#ecfdf5',
+        titleColor: '#064e3b'
+    },
+    indigo: {
+        bgColor: '#ffffff',
+        headerBg: '#6366f1',
+        headerColor: '#ffffff',
+        cellColor: '#312e81',
+        borderColor: '#c7d2fe',
+        stripeColor: '#eef2ff',
+        titleColor: '#312e81'
+    },
+    stone: {
+        bgColor: '#ffffff',
+        headerBg: '#78716c',
+        headerColor: '#ffffff',
+        cellColor: '#44403c',
+        borderColor: '#d6d3d1',
+        stripeColor: '#fafaf9',
+        titleColor: '#292524'
     }
 };