like before, please keep to one suggestion per post. and each suggestion needs to be fully described because i cannot understand what you mean with extremely vague words.
Xytronix Adding Links and On-Device-Links (with Symbols)
i don tthink this makes sense for orion to implement. imo, its out of scope for a browser to link to other apps. see https://hookproductivity.com for something that might suit your needs.
opening a link already opens it as a nested tab.
Xytronix Search Provider Integration (add multiple lines of Search with Kagi, Search with Google)
there are extensions that can provide thsi feature.
Xytronix Actions for Download, Move To, Download To, Send To, Share To
System Actions (Copy, Paste, Cut and Crop)
these already exist though?
Xytronix Extension integrations (Adding a link to Raindrop, Send to Password Managers)
Thus supporting default extension integrations
extensions can opt to suport the existing apis for this. it should not be up to orion to modify how an extension works
Adding Shortcuts
Adding Apple Intelligence Actions
Integration with Browser Actions
Workflows (covering multiple actions)
Auto Detect the type of the text/image/video for example date, time, link, place, country
these are extremely vague and very complicated to do.
workflows/shortcuts/browser actions are almost certainly best implemented as extensions.