fix(accounts): 账号管理改为单行增量更新并避免全量刷新

- 将编辑与重新授权成功事件改为回传更新后的账号对象
- 在账号列表页按 id 就地补丁更新单行数据并保留运行时容量字段
- 单账号操作（刷新凭证/清错/清限流/临时不可调度重置）改为单行更新
- 后端增强 clear-rate-limit 接口，返回更新后的账号对象
- 同步前端 clearRateLimit API 类型定义

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/internal/handler/admin/account_handler.go

@@ -1106,7 +1106,13 @@ func (h *AccountHandler) ClearRateLimit(c *gin.Context) {
 		return
 	}
 
-	response.Success(c, gin.H{"message": "Rate limit cleared successfully"})
+	account, err := h.adminService.GetAccount(c.Request.Context(), accountID)
+	if err != nil {
+		response.ErrorFrom(c, err)
+		return
+	}
+
+	response.Success(c, dto.AccountFromService(account))
 }
 
 // GetTempUnschedulable handles getting temporary unschedulable status