fix(douyu): 已绑定账号生成二维码不再立即成功, 正常等待扫码换绑

- 后端: get_xpd_bind_qr 生成二维码前记录绑定前状态(before_bound/
  before_role_name); 轮询判断改为 —— 未绑定: 检测到 bind_role=1 成功;
  已绑定(换绑): 角色名变化才算成功, 角色不变继续等待
- 前端: 弹窗保留二维码与角色信息; 轮询期间显示"当前绑定: 原角色",
  换绑成功显示新角色; 确认绑定维持手动(小程序内人工确认)

web/backend/services/douyu_runner.py

@@ -1086,7 +1086,7 @@ class DouyuBatchRunner:
         cookie: str,
         config: dict,
     ):
-        """生成和平小店绑定二维码并轮询等待微信扫码绑定完成。"""
+        """生成和平小店绑定二维码并轮询等待微信扫码绑定/换绑完成。"""
         client = self._client(cookie)
         act_alias = str(config.get("xpd_act_alias") or "").strip()
         if not act_alias:
@@ -1096,6 +1096,16 @@ class DouyuBatchRunner:
         account.xpd_bind_status = "xpd_bind_qr_ready"
         account.updated_at = datetime.now(timezone.utc)
         db.commit()
+        # 记录绑定前状态：已绑定账号生成二维码后必须等扫码换绑，不能立即成功
+        try:
+            before = client.xpd_bind_info(act_alias=act_alias)
+            result["before_bound"] = bool(before.get("bind_role"))
+            result["before_role_name"] = str(before.get("role_name") or "")
+            result["before_area_name"] = str(before.get("area_name") or "")
+            result["before_plat_name"] = str(before.get("plat_name") or "")
+        except Exception:
+            result["before_bound"] = False
+            result["before_role_name"] = ""
         result["bind_polling"] = True
         self._update_task_progress(
             db,
@@ -1134,7 +1144,13 @@ class DouyuBatchRunner:
         act_alias: str,
         result: dict,
     ) -> bool:
-        """轮询 bindInfo，检测到绑定角色即回写账号并返回 True。"""
+        """轮询 bindInfo 等待绑定/换绑完成。
+
+        - 绑定前未绑定：检测到 bind_role=1 即绑定成功
+        - 绑定前已绑定（换绑）：检测到角色名变化才算换绑成功，角色不变继续等
+        """
+        before_bound = bool(result.get("before_bound"))
+        before_role_name = str(result.get("before_role_name") or "")
         deadline = time.monotonic() + DOUYU_XPD_BIND_POLL_SECONDS
         poll_count = 0
         while not self._stop.is_set() and time.monotonic() <= deadline:
@@ -1144,7 +1160,9 @@ class DouyuBatchRunner:
                 result["bind_poll_count"] = poll_count
                 result["bind_polling"] = True
                 role_name = str(info.get("role_name") or "")
-                if info.get("bind_role") and role_name:
+                bound_now = bool(info.get("bind_role"))
+                changed = before_bound and bool(role_name) and role_name != before_role_name
+                if (not before_bound and bound_now and role_name) or changed:
                     result.update({key: value for key, value in info.items() if key != "raw"})
                     result["bind_polling"] = False
                     result["xpd_bound"] = True

web/frontend/src/pages/DouyuTasksPage.tsx

@@ -1064,30 +1064,36 @@ export default function DouyuTasksPage({ handbook }: { handbook: HandbookKind })
   const qrRoleName = resultText(qrRoleSourceResult, 'pending_role_name') || resultText(qrRoleSourceResult, 'role_name');
   const qrAreaName = resultText(qrRoleSourceResult, 'pending_area_name') || resultText(qrRoleSourceResult, 'area_name');
   const qrPlatName = resultText(qrRoleSourceResult, 'pending_plat_name') || resultText(qrRoleSourceResult, 'plat_name');
-  const qrCurrentRoleName = qrQueryRoleName
-    || resultText(qrResult, 'current_role_name')
-    || (
-      resultFlag(qrResult, 'is_bound_act')
-        ? resultText(qrResult, 'role_name')
-        : ''
-    )
-    || (qrQueryIsBoundAct ? qrQueryRoleName : '');
-  const qrCurrentAreaName = resultText(qrQueryResult, 'area_name')
-    || resultText(qrResult, 'current_area_name')
-    || (
-      resultFlag(qrResult, 'is_bound_act')
-        ? resultText(qrResult, 'area_name')
-        : ''
-    )
-    || (qrQueryIsBoundAct ? resultText(qrQueryResult, 'area_name') : '');
-  const qrCurrentPlatName = resultText(qrQueryResult, 'plat_name')
-    || resultText(qrResult, 'current_plat_name')
-    || (
-      resultFlag(qrResult, 'is_bound_act')
-        ? resultText(qrResult, 'plat_name')
-        : ''
-    )
-    || (qrQueryIsBoundAct ? resultText(qrQueryResult, 'plat_name') : '');
+  const qrCurrentRoleName = isXpdBindTask
+    ? resultText(qrResult, 'before_role_name')
+    : (qrQueryRoleName
+      || resultText(qrResult, 'current_role_name')
+      || (
+        resultFlag(qrResult, 'is_bound_act')
+          ? resultText(qrResult, 'role_name')
+          : ''
+      )
+      || (qrQueryIsBoundAct ? qrQueryRoleName : ''));
+  const qrCurrentAreaName = isXpdBindTask
+    ? resultText(qrResult, 'before_area_name')
+    : (resultText(qrQueryResult, 'area_name')
+      || resultText(qrResult, 'current_area_name')
+      || (
+        resultFlag(qrResult, 'is_bound_act')
+          ? resultText(qrResult, 'area_name')
+          : ''
+      )
+      || (qrQueryIsBoundAct ? resultText(qrQueryResult, 'area_name') : ''));
+  const qrCurrentPlatName = isXpdBindTask
+    ? resultText(qrResult, 'before_plat_name')
+    : (resultText(qrQueryResult, 'plat_name')
+      || resultText(qrResult, 'current_plat_name')
+      || (
+        resultFlag(qrResult, 'is_bound_act')
+          ? resultText(qrResult, 'plat_name')
+          : ''
+      )
+      || (qrQueryIsBoundAct ? resultText(qrQueryResult, 'plat_name') : ''));
   const qrRoleLine = qrBindReady
     ? [qrPlatName, qrAreaName, qrRoleName].filter(Boolean).join(' - ')
     : '';