v1.3.0

1. 将 stream_pushs（RTMP 推流）和 stream_proxys（RTSP 拉流代理）两个独立表合并到 channels 表
2. 删除 push 和 proxy 领域模块，统一由 ipc 模块管理
3. 移除 /stream_pushs 和 /stream_proxys 接口
4. 新增 POST /channels 支持添加 RTMP/RTSP 通道
5. 启动时检测数据自动完成旧版本迁移
6. RTMP/RTSP 添加通道时支持搜索选择现有设备或创建新设备
7. 重构前端样式，从右侧滑动抽屉改为弹窗

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1. Merge the two separate tables stream_pushs (RTMP push streams) and stream_proxys (RTSP pull stream proxies) into a unified channels table.
2. Remove the dedicated push and proxy domain modules and manage them uniformly under the ipc module.
3. Remove the /stream_pushs and /stream_proxys API endpoints.
4. Add a new POST /channels endpoint to support creating RTMP/RTSP channels.
5. Automatically detect and migrate legacy data during application startup.
6. When adding RTMP/RTSP channels, allow users to either search and select an existing device or create a new one.
7. Refactor the frontend UI: replace the right-side sliding drawer with a modal dialog.