ui: pick Hikvision channel (1-32) instead of typing full stream paths
Cameras (esp. an NVR at one IP with many channels) are configured by a channel
number now: channel N → main /Streaming/Channels/{N*100+1}, sub {N*100+2}
(101/102 = ch1, 1101/1102 = ch11, 3201/3202 = ch32). The add/edit form and the
bulk-edit row use a 1-32 dropdown; the camera list shows "канал N". Frontend
derives main_path/sub_path from the channel, so the backend is unchanged.
VERSION 0.0.132.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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