iPhone
Is there any way to delete all photos from iPhone without deleting them from iCloud?
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Not if you have iCloud Photos turned on. However you can completely erase the phone using the instructions in What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support and that will not affect anything in iCloud or other devices. If you want to turn off iCloud Photos, see Information in: Get help with iCloud Photos - Apple Support
iCloud Photos is a syncing service. Any photo you delete from a device where iCloud Photos is turned on will also be deleted from iCloud and from any other device connected to iCloud Photos. You can potentially reduce the storage space required on a device by turning on Optimize Storage. See: https://support.apple.com/en-us/HT204264
Apple does not currently offer cloud-only storage for photos. If that is what you want or need, you may want to explore 3rd party options such as Google Photos or Dropbox.
Another way that photos may be on iCloud (if you don’t have iCloud Photos turned on) is via a backup of an iOS device. The only thing you can do with a backup is use it to restore a device or set up a new device. The contents of backups are not viewable at iCloud.com and if you delete a photo from a device it will not be included in future backups and will be lost.