refactor(weixin-ilink): 措辞纠正 —「会话过期」→「会话被 iLink 拒绝」（零逻辑改动）

事实（主人 2026-10-03 确认）：iLink 的 bot token 是长期凭据（一个月前扫码的仍可用）；errcode=-14 是 iLink 侧拒绝/作废该会话，不是时间性过期；且至今未观测到真实 -14（当日全部日志 0 次）。此前代码把这些写成「过期」，属沿用的旧命名，现纠正。
- 纯改名/文案：ErrSessionExpired→ErrSessionRejected、errSessionExpired→errcodeSessionRejected、expired/expiredToken→rejected/rejectedToken、markExpired/expiredLocked/expiredState→markRejected/rejectedLocked/rejectedState；409 错误码 session_expired→session_rejected
- 行为一字未改：显式标记 / Connect 不假 OK / 面板 needsRescan+lastError / 扫码或换新 token 即清除 全部保留
- 微信协议自身的「二维码过期」与 auth 的 JWT/refresh 过期一律未动（那些是真·时间性过期）
- Docs/api-client v0.39 补事实说明；顺手收尾 3 处残留注释（admin.go / channelbridge/inbound.go / readloop_test.go）

plugins/channels/weixin_ilink/poll.go

@@ -35,7 +35,7 @@ const (
 type getupdatesResp struct {
 	// Ret is the top-level business result; non-zero is a transient error.
 	Ret int `json:"ret"`
-	// Errcode is the platform error code; -14 means the session expired.
+	// Errcode is the platform error code; -14 means iLink rejected the session.
 	Errcode int `json:"errcode"`
 	// Msgs holds the raw inbound messages delivered in this poll.
 	Msgs []json.RawMessage `json:"msgs"`
@@ -94,13 +94,13 @@ func (a *Adapter) ReadMessages(ctx context.Context, emit func(adapter.UnifiedMes
 		}
 
 		failures = 0
-		if resp.Errcode == errSessionExpired {
-			// The bot token is dead: retrying cannot help and the poll loop would go
-			// mute for good. Record the explicit expired state (which also drops the
-			// connected flag and logs at ERROR) and stop the loop; the owner has to
-			// re-scan, and everything downstream sees ErrSessionExpired until a fresh
-			// token arrives.
-			a.markExpired(rescanReasonGetUpdates)
+		if resp.Errcode == errcodeSessionRejected {
+			// iLink rejected this session credential: retrying cannot help and the poll
+			// loop would go mute for good. Record the explicit rejected state (which also
+			// drops the connected flag and logs at ERROR) and stop the loop; the owner
+			// has to re-scan, and everything downstream sees ErrSessionRejected until a
+			// fresh token arrives.
+			a.markRejected(rescanReasonGetUpdates)
 			return
 		}
 		if resp.Ret != 0 {