fix: reconcile upstream keys on list/generate/import to prevent stale key imports

- Extract reconcile_upstream_keys() to website_sync.py (shared scheduler + on-demand)
- Add reconcile_upstream_keys_full() for on-demand reconciliation at three entry points:
  list_generated_keys, generate_keys_by_groups, import_upstream_keys_as_accounts
- Safe on failure: active_group_ids=None / remote_key_ids=None skip cleanup
- Support custom managed_prefix via _fetch_remote_managed_key_ids() helper
- Exclude orphaned keys from frontend importable list
- Remove hardcoded search='SmartUp' from scheduler path

backend/app/routers/websites.py

@@ -34,7 +34,7 @@ from app.schemas.website import (
 )
 
 from app.services.website_client import Sub2ApiWebsiteClient
-from app.services.website_sync import binding_sources, sync_binding, build_rate_priority_map
+from app.services.website_sync import binding_sources, sync_binding, build_rate_priority_map, reconcile_upstream_keys_full
 from app.utils.auth import get_current_user
 
 router = APIRouter(tags=["websites"])
@@ -483,6 +483,20 @@ def import_upstream_keys_as_accounts(
         .order_by(UpstreamGeneratedKey.id)
         .all()
     )
+    # 导入前尝试对账（失败不阻塞，仅打日志—避免远端不可达时误删本地 Key）
+    upstream_ids = {row.upstream_id for row in rows}
+    for uid in upstream_ids:
+        try:
+            reconcile_upstream_keys_full(db, uid)
+        except Exception as exc:
+            logger.warning("import reconcile failed for upstream %s: %s", uid, exc)
+    # 重新查询（对账成功时已清理失效 Key）
+    rows = (
+        db.query(UpstreamGeneratedKey)
+        .filter(UpstreamGeneratedKey.id.in_(body.upstream_key_ids))
+        .order_by(UpstreamGeneratedKey.id)
+        .all()
+    )
     found_ids = {row.id for row in rows}
     missing_ids = [kid for kid in body.upstream_key_ids if kid not in found_ids]
     items: list[ImportAccountItem] = [
@@ -518,6 +532,18 @@ def import_upstream_keys_as_accounts(
 
     with _client(website) as c:
         for row in rows:
+            # 跳过远端已不存在或导入失败的 Key（对账后标记为 orphaned / import_failed）
+            if row.status in ("orphaned", "failed", "import_failed"):
+                items.append(ImportAccountItem(
+                    upstream_key_id=row.id,
+                    source_group_id=row.group_id,
+                    source_group_name=row.group_name,
+                    target_group_id=body.target_group_map.get(row.group_id),
+                    platform=body.default_platform,
+                    status="failed",
+                    message="远端 Key 已不存在，请重新生成",
+                ))
+                continue
             # 先确定平台（失败项也需要记录）
             if body.platform_mode == "auto":
                 platform = _detect_platform(