feat(agent): agent 0.11.0 新增证书清单与 Nginx 重载，公网 Agent 页并排展示 VPS 资源与证书（v1.2.5）

agent 0.11.0：新增 GET /api/v1/certs（遍历证书目录、crypto/x509 解析 fullchain.pem 到期时间、按剩余天数排序、解析失败记 warnings）与 POST /api/v1/nginx/reload（回传 nginx -t 与 reload 的失败原因，成功后失效可用性探测缓存）

应用侧：AgentClient.Certs / NginxReload + service / handler / router；agent 版本要求提到 ≥ 0.11.0（旧版本仍按 404/405 降级为升级提示）

前端：公网 Agent 页新增「VPS 证书」卡（域名/剩余天数/Fonu 证书库/到期时间，与 Fonu 证书库交叉核对）；Nginx 卡新增「重载 Nginx」并显示失败原因；VPS 资源与 VPS 证书改为并排各占半行（dep-grid 6 列 + span 分配，窄屏复位）

二进制：内嵌 fonu-agent-linux-amd64 / arm64 重编；VERSION → 1.2.5

web/src/api/client.ts

@@ -290,7 +290,13 @@ export const api = {
   uninstallFrpAgent: (id: number, keepData: boolean) => request<{ ok: boolean; output: string }>(`/api/frpmulti/servers/${id}/agent/uninstall?keep_data=${keepData}`, { method: 'POST' }),
   sshDiagnoseFrpAgent: (id: number) => request<{ output: string }>(`/api/frpmulti/servers/${id}/agent/ssh-diagnose`, { method: 'POST' }),
   getFrpAgentStatus: (id: number) => request<import('./types').FrpAgentStatus>(`/api/frpmulti/servers/${id}/agent/status`),
-    getFrpAgentMetrics: (id: number) =>
+    getFrpAgentCerts: (id: number) =>
+    request<import('./types').FrpAgentCerts>(`/api/frpmulti/servers/${id}/agent/certs`),
+  reloadFrpAgentNginx: (id: number) =>
+    request<import('./types').FrpAgentNginxReload>(`/api/frpmulti/servers/${id}/agent/nginx/reload`, {
+      method: 'POST',
+    }),
+  getFrpAgentMetrics: (id: number) =>
     request<import('./types').FrpAgentMetrics>(`/api/frpmulti/servers/${id}/agent/metrics`),
   getFrpAgentNginxLogs: (id: number, type: 'access' | 'error', lines = 200) =>
     request<import('./types').FrpAgentNginxLogs>(

web/src/api/types.ts

@@ -736,6 +736,30 @@ export interface FrpRouteHealthSummary {
   failed_servers?: string[]
 }
 
+export interface FrpAgentCertificate {
+  domain: string
+  cert_path: string
+  key_path: string
+  not_after?: string
+  days_left: number
+}
+
+export interface FrpAgentCerts {
+  certs: FrpAgentCertificate[]
+  warnings?: string[]
+  dir?: string
+  checked_at: string
+}
+
+export interface FrpAgentNginxReload {
+  ok: boolean
+  test_ok?: boolean
+  test_error?: string
+  reload_ok?: boolean
+  reload_error?: string
+  checked_at: string
+}
+
 export interface FrpAgentMetrics {
   cpu_percent: number
   mem_used_bytes: number