refactor(frontend): 完成所有组件的内联SVG统一替换为Icon组件

- 扩展 Icon.vue 组件，新增 60+ 图标路径
  - 导航类: arrowRight, arrowLeft, arrowUp, arrowDown, chevronUp, externalLink
  - 状态类: checkCircle, xCircle, exclamationCircle, exclamationTriangle, infoCircle
  - 用户类: user, userCircle, userPlus, users
  - 文档类: document, clipboard, copy, inbox
  - 操作类: download, upload, filter, sort
  - 安全类: key, lock, shield
  - UI类: menu, calendar, home, terminal, gift, creditCard, mail
  - 数据类: chartBar, trendingUp, database, cube
  - 其他: bolt, sparkles, cloud, server, sun, moon, book 等

- 重构 56 个 Vue 组件，用 Icon 组件替换内联 SVG
  - 净减少约 2200 行代码
  - 提升代码可维护性和一致性
  - 统一图标样式和尺寸管理

frontend/src/components/common/DateRangePicker.vue

@@ -6,33 +6,17 @@
       :class="['date-picker-trigger', isOpen && 'date-picker-trigger-open']"
     >
       <span class="date-picker-icon">
-        <svg
-          class="h-4 w-4"
-          fill="none"
-          stroke="currentColor"
-          viewBox="0 0 24 24"
-          stroke-width="1.5"
-        >
-          <path
-            stroke-linecap="round"
-            stroke-linejoin="round"
-            d="M6.75 3v2.25M17.25 3v2.25M3 18.75V7.5a2.25 2.25 0 012.25-2.25h13.5A2.25 2.25 0 0121 7.5v11.25m-18 0A2.25 2.25 0 005.25 21h13.5A2.25 2.25 0 0021 18.75m-18 0v-7.5A2.25 2.25 0 015.25 9h13.5A2.25 2.25 0 0121 11.25v7.5"
-          />
-        </svg>
+        <Icon name="calendar" size="sm" />
       </span>
       <span class="date-picker-value">
         {{ displayValue }}
       </span>
       <span class="date-picker-chevron">
-        <svg
-          :class="['h-4 w-4 transition-transform duration-200', isOpen && 'rotate-180']"
-          fill="none"
-          stroke="currentColor"
-          viewBox="0 0 24 24"
-          stroke-width="1.5"
-        >
-          <path stroke-linecap="round" stroke-linejoin="round" d="M19.5 8.25l-7.5 7.5-7.5-7.5" />
-        </svg>
+        <Icon
+          name="chevronDown"
+          size="sm"
+          :class="['transition-transform duration-200', isOpen && 'rotate-180']"
+        />
       </span>
     </button>
 
@@ -65,19 +49,7 @@
             />
           </div>
           <div class="date-picker-separator">
-            <svg
-              class="h-4 w-4 text-gray-400"
-              fill="none"
-              stroke="currentColor"
-              viewBox="0 0 24 24"
-              stroke-width="1.5"
-            >
-              <path
-                stroke-linecap="round"
-                stroke-linejoin="round"
-                d="M17.25 8.25L21 12m0 0l-3.75 3.75M21 12H3"
-              />
-            </svg>
+            <Icon name="arrowRight" size="sm" class="text-gray-400" />
           </div>
           <div class="date-picker-field">
             <label class="date-picker-label">{{ t('dates.endDate') }}</label>
@@ -106,6 +78,7 @@
 <script setup lang="ts">
 import { ref, computed, watch, onMounted, onUnmounted } from 'vue'
 import { useI18n } from 'vue-i18n'
+import Icon from '@/components/icons/Icon.vue'
 
 interface DatePreset {
   labelKey: string