feat: send test messages during bot connection checks

src/channels/weixin/weixin-bridge.mjs

@@ -18,6 +18,7 @@ import {
   imagePromptUserMessage,
   promptContentForMessage,
 } from '../shared/image-prompt.mjs';
+import { rememberConnectionTestTarget } from '../shared/connection-test.mjs';
 
 const INTERACTION_RESOLVED_TEXT = '这个问题已在其他客户端处理，无需再次回答。';
 
@@ -250,6 +251,7 @@ export class WeixinHarnessBridge {
       if (!hasImages && command === '/status') {
         await this.#harness.ensureRunning({ signal: this.#signal });
         await this.#send(sender, '微信与 DeepSeek Harness 连接正常。', contextToken, runId);
+        rememberConnectionTestTarget(this.#state, { toUserId: sender });
         await this.#state.markSeen(messageId);
         return;
       }

src/channels/weixin/weixin-controller.mjs

@@ -6,6 +6,10 @@ import {
   WeixinApiError,
 } from './weixin-api.mjs';
 import { deriveWeixinBotIdentity, maskWeixinAccountId } from './config-store.mjs';
+import {
+  connectionTestMessage,
+  connectionTestTargetUnavailable,
+} from '../shared/connection-test.mjs';
 
 const ACTIVE_ATTEMPT_STATES = new Set([
   'starting',
@@ -240,6 +244,20 @@ export class WeixinController {
     return this.status();
   }
 
+  async sendConnectionTest(botId) {
+    const config = this.#configStore.get(botId);
+    if (!config) throw new Error('Unknown Weixin account');
+    return this.#withBotTransition(botId, async () => {
+      const runtime = this.#runtimes.get(botId);
+      if (!runtime?.status?.ready || typeof runtime.sendConnectionTest !== 'function') {
+        throw connectionTestTargetUnavailable('微信机器人');
+      }
+      return runtime.sendConnectionTest(connectionTestMessage(
+        `微信机器人（${maskWeixinAccountId(config.accountId)}）`,
+      ));
+    });
+  }
+
   async deleteBot(botId) {
     const config = this.#configStore.get(botId);
     if (!config) throw new Error('Unknown Weixin account');

src/channels/weixin/weixin-runtime.mjs

@@ -1,5 +1,9 @@
 import { WeixinApiError } from './weixin-api.mjs';
 import { createWeixinBridgeStatus, WeixinHarnessBridge } from './weixin-bridge.mjs';
+import {
+  connectionTestTarget,
+  connectionTestTargetUnavailable,
+} from '../shared/connection-test.mjs';
 
 const DEFAULT_START_RETRY_DELAYS_MS = Object.freeze([250, 1_000, 3_000]);
 
@@ -250,4 +254,25 @@ export class WeixinRuntime {
     this.#status.weixinConnectionState = 'idle';
     return this.status;
   }
+
+  async sendConnectionTest(text) {
+    const remembered = connectionTestTarget(this.#state);
+    const toUserId = typeof remembered?.toUserId === 'string' && remembered.toUserId.trim()
+      ? remembered.toUserId.trim()
+      : typeof this.#config.ownerUserId === 'string' && this.#config.ownerUserId.trim()
+        ? this.#config.ownerUserId.trim()
+        : null;
+    if (!toUserId) throw connectionTestTargetUnavailable('微信机器人');
+    if (!this.#status.ready || !this.#abortController) {
+      throw new Error('Weixin runtime is not connected');
+    }
+    await this.#api.sendText({
+      baseUrl: this.#config.baseUrl,
+      token: this.#token,
+      toUserId,
+      text,
+      signal: this.#abortController.signal,
+    });
+    return { sent: true };
+  }
 }