feat(priority): group priority changed notifications by target group and fetch remote account details

backend/app/utils/dingtalk.py

@@ -79,11 +79,41 @@ def format_dingtalk_priority_changed(
         f"- **摘要**：{success} 更新 / {failed} 失败 / {skipped} 跳过",
         "",
     ]
+
+    # 按目标分组聚合
+    from collections import defaultdict
+    groups = defaultdict(list)
     for u in updates:
-        emoji = {"success": "✅", "failed": "❌", "skipped": "⏭️"}.get(u.get("status", ""), "➖")
-        gid = u.get("group_id", "?")
-        priority = u.get("new_priority", "—")
-        lines.append(f"{emoji} `{gid}` → priority={priority}")
+        tg_name = u.get("target_group_name") or u.get("target_group_id") or u.get("group_id") or "未知目标分组"
+        groups[tg_name].append(u)
+
+    for tg_name, items in groups.items():
+        lines.append(f"目标分组：{tg_name}")
+        for u in items:
+            emoji = {"success": "✅", "failed": "❌", "skipped": "⏭️"}.get(u.get("status", ""), "➖")
+            acc_name = u.get("account_name") or u.get("account_id") or "未知账号"
+            acc_id = u.get("account_id") or "未知ID"
+            
+            old_p = u.get("old_priority")
+            old_p_str = "未知" if old_p in (None, "", "未知") else str(old_p)
+            
+            new_p = u.get("new_priority")
+            new_p_str = "未知" if new_p in (None, "", "未知") else str(new_p)
+            
+            src_group = u.get("source_group_name") or u.get("source_group_id") or "未知来源"
+            
+            rate = u.get("source_rate")
+            rate_str = str(rate) if rate is not None else "—"
+            
+            line = f"- {emoji} {acc_name}（账号ID {acc_id}）：old={old_p_str} → new={new_p_str}，来源分组={src_group}，倍率={rate_str}"
+            if u.get("status") == "failed" and u.get("message"):
+                line += f"，原因={u.get('message')}"
+            lines.append(line)
+        lines.append("")
+
+    while lines and not lines[-1]:
+        lines.pop()
+
     return {
         "msgtype": "markdown",
         "markdown": {