feat(agent): agent 0.10.0 新增资源/日志/配置回读端点，前端接入 VPS 资源与公网 Nginx 日志（v1.2.4）

agent 0.10.0：新增 GET /api/v1/metrics（资源采集，复用 internal/sysinfo；CPU 两次采样差值 + 1 秒内复用上次结果）、GET /api/v1/logs/nginx（日志尾部，路径白名单来自 nginx -T / 环境变量 / 默认目录，32KB 块倒读、单行 4KB 截断、上限 2000 行）、GET /api/v1/frps/config（frps.toml 回读，256KB 上限）

internal/sysinfo：补 LoadAvg 与 UptimeSeconds（Linux /proc/loadavg 与 /proc/uptime、Windows GetTickCount64、其它平台空值）

应用侧：AgentClient 三个只读方法；request 错误改为带状态码的 statusError，新增 ErrAgentEndpointMissing，把 404/405 统一转成「agent 版本过低需 ≥ 0.10.0」提示；补 service/handler/router

前端：公网 Agent 页「VPS 资源」横排带（占满环境与依赖整行）；日志中心「公网 Nginx」页签；frps 同源配置弹窗「比对 VPS 实际文件」

二进制：内嵌 fonu-agent-linux-amd64 / arm64 用新代码重编；VERSION → 1.2.4

web/src/api/client.ts

@@ -290,7 +290,15 @@ 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`),
-    getFrpAgentRouteDrift: (id: number) =>
+    getFrpAgentMetrics: (id: number) =>
+    request<import('./types').FrpAgentMetrics>(`/api/frpmulti/servers/${id}/agent/metrics`),
+  getFrpAgentNginxLogs: (id: number, type: 'access' | 'error', lines = 200) =>
+    request<import('./types').FrpAgentNginxLogs>(
+      `/api/frpmulti/servers/${id}/agent/logs/nginx?type=${type}&lines=${lines}`,
+    ),
+  getFrpAgentFRPSConfig: (id: number) =>
+    request<import('./types').FrpAgentFRPSConfig>(`/api/frpmulti/servers/${id}/agent/frps-config`),
+  getFrpAgentRouteDrift: (id: number) =>
     request<import('./types').FrpRouteDriftReport>(`/api/frpmulti/servers/${id}/agent/routes/drift`),
   redeployFrpAgentRoutes: (id: number) =>
     request<import('./types').FrpRedeployAllResult>(`/api/frpmulti/servers/${id}/agent/routes/redeploy`, {

web/src/api/types.ts

@@ -736,6 +736,35 @@ export interface FrpRouteHealthSummary {
   failed_servers?: string[]
 }
 
+export interface FrpAgentMetrics {
+  cpu_percent: number
+  mem_used_bytes: number
+  mem_total_bytes: number
+  disk_used_bytes: number
+  disk_total_bytes: number
+  disk_path?: string
+  load_avg?: number[]
+  uptime_seconds?: number
+  checked_at: string
+}
+
+export interface FrpAgentNginxLogs {
+  type: 'access' | 'error'
+  path: string
+  lines: string[]
+  truncated: boolean
+  checked_at: string
+}
+
+export interface FrpAgentFRPSConfig {
+  path: string
+  exists: boolean
+  content: string
+  truncated?: boolean
+  mod_time?: string
+  checked_at: string
+}
+
 export interface FrpRouteDriftItem {
   domain: string
   kind: 'missing' | 'orphan' | 'not_loaded' | 'content_mismatch'