fix(前端): 修复 ESLint 代码规范问题

- 修复 AccountTableFilters.vue 中的 vue/no-mutating-props 错误，使用 emit 模式替代直接修改 props
- 修复 TypeScript 类型错误，支持 Select 组件的 null 值类型
- 为所有空 catch 块添加错误日志，提升代码可维护性和调试能力
- 涉及文件：AccountTableFilters.vue, UserAllowedGroupsModal.vue, UserApiKeysModal.vue, UserBalanceModal.vue, AccountsView.vue, UsageView.vue, DashboardView.vue, ProfileView.vue

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/views/admin/UsageView.vue

@@ -35,9 +35,9 @@ const loadLogs = async () => {
   try {
     const res = await adminAPI.usage.list({ page: pagination.page, page_size: pagination.page_size, ...filters.value }, { signal: c.signal })
     if(!c.signal.aborted) { usageLogs.value = res.items; pagination.total = res.total }
-  } catch {} finally { if(abortController === c) loading.value = false }
+  } catch (error: any) { if(error?.name !== 'AbortError') console.error('Failed to load usage logs:', error) } finally { if(abortController === c) loading.value = false }
 }
-const loadStats = async () => { try { const s = await adminAPI.usage.getStats(filters.value); usageStats.value = s } catch {} }
+const loadStats = async () => { try { const s = await adminAPI.usage.getStats(filters.value); usageStats.value = s } catch (error) { console.error('Failed to load usage stats:', error) } }
 const applyFilters = () => { pagination.page = 1; loadLogs(); loadStats() }
 const resetFilters = () => { startDate.value = formatLD(weekAgo); endDate.value = formatLD(now); filters.value = { start_date: startDate.value, end_date: endDate.value }; applyFilters() }
 const handlePageChange = (p: number) => { pagination.page = p; loadLogs() }