fix: Sub2ApiWebsiteClient.list_accounts 支持分页拉取，避免只拿到默认第一页 20 条导致误建重复账号

backend/app/services/website_client.py

@@ -334,17 +334,83 @@ class Sub2ApiWebsiteClient:
         return None
 
     def list_accounts(self, endpoint: str = "/accounts") -> list[dict[str, Any]] | None:
-        """拉取远端账号列表。成功返回账号 dict 列表，失败返回 None。"""
-        try:
-            resp = self._request("GET", endpoint)
-        except Exception:
-            logger.warning("account list fetch failed for %s", endpoint, exc_info=True)
-            return None
-        items = self._unwrap_list(resp)
-        if items is None:
-            logger.warning("account list unexpected format for %s", endpoint)
-            return None
-        return [item for item in items if isinstance(item, dict)]
+        """拉取远端账号列表。支持分页拉取，成功返回账号 dict 列表，失败返回 None。"""
+        base_path = endpoint
+        query_params = {}
+        if "?" in endpoint:
+            base_path, query_str = endpoint.split("?", 1)
+            for part in query_str.split("&"):
+                if "=" in part:
+                    k, v = part.split("=", 1)
+                    query_params[k] = v
+
+        page_size = 100
+        if "page_size" in query_params:
+            try:
+                page_size = int(query_params["page_size"])
+            except ValueError:
+                pass
+
+        page = 1
+        all_items = []
+
+        while True:
+            params = dict(query_params)
+            params["page"] = str(page)
+            params["page_size"] = str(page_size)
+
+            qp_str = "&".join(f"{k}={v}" for k, v in params.items())
+            current_path = f"{base_path}?{qp_str}"
+
+            try:
+                resp = self._request("GET", current_path)
+            except Exception:
+                logger.warning("account list fetch failed for %s", current_path, exc_info=True)
+                return None
+
+            items = self._unwrap_list(resp)
+            if items is None:
+                logger.warning("account list unexpected format for %s", current_path)
+                return None
+
+            all_items.extend([item for item in items if isinstance(item, dict)])
+
+            if isinstance(resp, dict):
+                # 尝试从顶层或嵌套的 data 字典中提取分页字段
+                meta = resp
+                data_val = resp.get("data")
+                if isinstance(data_val, dict) and any(k in data_val for k in ("pages", "total", "page_size")):
+                    meta = data_val
+
+                pages = meta.get("pages")
+                if pages is not None:
+                    try:
+                        pages_val = int(pages)
+                        if page >= pages_val:
+                            break
+                        page += 1
+                        continue
+                    except (ValueError, TypeError):
+                        pass
+
+                total = meta.get("total")
+                current_page_size = meta.get("page_size")
+                if total is not None and current_page_size is not None:
+                    try:
+                        total_val = int(total)
+                        page_size_val = int(current_page_size)
+                        import math
+                        calculated_pages = math.ceil(total_val / page_size_val)
+                        if page >= calculated_pages:
+                            break
+                        page += 1
+                        continue
+                    except (ValueError, TypeError):
+                        pass
+
+            break
+
+        return all_items
 
     def _get_account_ids(self, endpoint: str = "/accounts") -> set[str] | None:
         """拉取远端账号列表。成功返回 ID 集合（可能为空），解析失败返回 None。"""