系统设置增加备份恢复：中控本机备份，并可下载各客户端备份。

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/bridge_client_lib.py

@@ -269,6 +269,69 @@ def pull_all_stats(window: str = "7d") -> list[dict[str, Any]]:
     return results
 
 
+def fetch_backup_list(inst: dict[str, Any]) -> dict[str, Any]:
+    base = (inst.get("base_url") or "").rstrip("/")
+    token = (inst.get("bridge_token") or "").strip()
+    if not base or not token:
+        return {"ok": False, "msg": "缺少 URL 或 Token", "items": []}
+    url = f"{base}/api/hub/backup/list"
+    try:
+        r = requests.get(
+            url,
+            headers={"X-Hub-Token": token, "Accept": "application/json"},
+            timeout=_timeout(),
+        )
+        data = r.json() if r.content else {}
+        if isinstance(data, dict):
+            data.setdefault("instance_id", inst.get("id"))
+            data.setdefault("instance_name", inst.get("name"))
+            return data
+        return {"ok": False, "msg": f"HTTP {r.status_code}", "items": []}
+    except Exception as e:
+        return {
+            "ok": False,
+            "msg": str(e) or "拉取失败",
+            "items": [],
+            "instance_id": inst.get("id"),
+            "instance_name": inst.get("name"),
+        }
+
+
+def fetch_backup_file(inst: dict[str, Any], name: str) -> tuple[bool, bytes | None, str]:
+    """返回 (ok, content, msg_or_filename)."""
+    base = (inst.get("base_url") or "").rstrip("/")
+    token = (inst.get("bridge_token") or "").strip()
+    safe = (name or "").strip()
+    if not base or not token or not safe:
+        return False, None, "参数不完整"
+    url = f"{base}/api/hub/backup/download/{safe}"
+    try:
+        r = requests.get(
+            url,
+            headers={"X-Hub-Token": token, "Accept": "application/gzip, application/json"},
+            timeout=max(_timeout(), 60.0),
+            stream=True,
+        )
+        ctype = (r.headers.get("content-type") or "").lower()
+        if r.status_code != 200:
+            try:
+                data = r.json()
+                return False, None, (data.get("msg") if isinstance(data, dict) else None) or f"HTTP {r.status_code}"
+            except Exception:
+                return False, None, f"HTTP {r.status_code}"
+        if "json" in ctype:
+            try:
+                data = r.json()
+                return False, None, (data.get("msg") if isinstance(data, dict) else None) or "下载失败"
+            except Exception:
+                return False, None, "下载失败"
+        return True, r.content, os.path.basename(safe)
+    except requests.Timeout:
+        return False, None, "下载超时"
+    except Exception as e:
+        return False, None, str(e) or "下载失败"
+
+
 def dispatch_cond_order_to_ids(instance_ids: list[int], payload: dict[str, Any]) -> list[dict[str, Any]]:
     results = []
     for iid in instance_ids: