web: reset links to the default mode, and keep CN agents dial-only by default [CI]

POST /api/admin/links/reset clears every manual link setting and turns automatic linking on. In the default rules a listening node in CN ranks below a listening node elsewhere, so the CN side dials; the links are pushed again when a node's country is first resolved or changes.

web/admin/src/pages/Links.tsx

@@ -7,7 +7,7 @@ import { Chip, Empty, ErrorNotice, Spinner, useAction } from '@shared/ui'
 
 /**
  * 线路：Agent 之间的线路，一对 Agent 一条。自动连接开着时所有可达的 Agent 两两相连，关着时只连手动选中的；
- * 每一对都可以手动强制开或关（点一下切换，「↺」回到自动）。拨号的一方由面板决定（不监听的拨监听的；都监听时 id 较小的拨）。
+ * 每一对都可以手动强制开或关（点一下切换，「↺」回到自动）。拨号的一方由面板决定（不监听的拨监听的；国内的节点默认只拨出；其余 id 较小的拨），「恢复默认连接模式」清掉所有手动设置。
  */
 /** 线路连接状态：control_* 是与 Agent 的控制连接（断开即失联），task_* 是测量用的 QUIC 数据通道。 */
 const CONNECTION_LABELS: Record<string, string> = {
@@ -36,6 +36,11 @@ export function Links({ dialerId }: { dialerId?: string }) {
     await run(() => api.post(`/api/admin/links/${link.dialer_id}/${link.listener_id}/retry`), '已要求 Agent 立即重试；若 Agent 离线，恢复后会自动重连')
     matrix.reload()
   }
+  const resetLinks = async () => {
+    if (!window.confirm('清掉所有手动设置并打开自动连接，每对 Agent 按默认规则重新连线？')) return
+    await run(() => api.post('/api/admin/links/reset'), '已恢复默认连接模式')
+    matrix.reload()
+  }
   const setAuto = async (on: boolean) => {
     await run(() => api.patch('/api/admin/settings', { 'fleet.auto_link': on }), on ? '已开启自动连接' : '已关闭自动连接')
     matrix.reload()
@@ -47,7 +52,8 @@ export function Links({ dialerId }: { dialerId?: string }) {
         <b>{dialerId ? '拨出连接' : 'Agent 节点画板'}</b>
         {matrix.loading && !matrix.data ? <Spinner /> : null}
         <span className="muted">{dialerId ? '点格子调整单方向的连接策略。' : '每对 Agent 一条线路，只测一次 RTT；点击连线查看质量或开关。'}</span>
-        {!dialerId ? <label className="switch right">
+        {!dialerId ? <button type="button" className="btn small right" disabled={busy} title="默认规则：不监听的节点拨监听的；国内（CN）的节点默认只拨出、不当被连接方；其余按 id 小的拨。手动设置会被清掉。" onClick={resetLinks}>恢复默认连接模式</button> : null}
+        {!dialerId ? <label className="switch">
           <input type="checkbox" checked={matrix.data?.auto_link ?? true} disabled={busy} onChange={(e) => setAuto(e.target.checked)} />
           自动连接 {matrix.data?.auto_link === false ? '关' : '开'}
         </label> : null}

web/shared/api/schema.ts

@@ -1040,6 +1040,23 @@ export interface paths {
         patch?: never;
         trace?: never;
     };
+    "/api/admin/links/reset": {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        get?: never;
+        put?: never;
+        /** Drop every manual link setting and turn automatic linking on: who dials whom follows the default rules again */
+        post: operations["links_reset"];
+        delete?: never;
+        options?: never;
+        head?: never;
+        patch?: never;
+        trace?: never;
+    };
     "/api/admin/links/{dialer_id}/{listener_id}": {
         parameters: {
             query?: never;
@@ -5891,6 +5908,44 @@ export interface operations {
             };
         };
     };
+    links_reset: {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        requestBody?: never;
+        responses: {
+            /** @description OK */
+            200: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["LinkMatrixDto"];
+                };
+            };
+            /** @description Unauthorized */
+            401: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/problem+json": components["schemas"]["ProblemDto"];
+                };
+            };
+            /** @description Forbidden */
+            403: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/problem+json": components["schemas"]["ProblemDto"];
+                };
+            };
+        };
+    };
     links_set: {
         parameters: {
             query?: never;