fix: 修复API Keys页面的undefined错误

- 修复filteredAndSortedApiKeys未定义错误，改为使用sortedApiKeys
- 添加缺失的分页相关变量定义（currentPage, pageSize, totalPages等）
- 添加paginatedApiKeys计算属性实现分页功能
- 修复CreateApiKeyModal和EditApiKeyModal中localAccounts防御性编程
- 添加筛选条件变化时重置页码的逻辑
- 修复"Cannot read properties of undefined (reading 'length')"错误

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

web/admin-spa/src/components/apikeys/CreateApiKeyModal.vue

@@ -699,7 +699,12 @@ onMounted(async () => {
   supportedClients.value = await clientsStore.loadSupportedClients()
   availableTags.value = await apiKeysStore.fetchTags()
   // 初始化账号数据
-  localAccounts.value = props.accounts
+  if (props.accounts) {
+    localAccounts.value = {
+      claude: props.accounts.claude || [],
+      gemini: props.accounts.gemini || []
+    }
+  }
 })
 
 // 刷新账号列表