[FEAT] Share via Vocechat PWA

[PhilGoud]

Is your feature request related to a problem? Please describe.
I can't share via Vocechat webapp because the manifest dosen't allow it AND the api doesn't have a way to allow sending a message THEN telling to whom

Describe the solution you'd like
a /share endpoint would be nice

and a manifest with these lines added :

"share_target": {
"action": "/share",
"method": "POST",
"enctype": "application/x-www-form-urlencoded",
"params": {
"title": "title",
"text": "text",
"url": "url"
}
},

Additional context
The function is active in the webapp with le lines i pasted before, but as there is no way to get to a /share endpoint, i can't do anything.

That would be realllly nice :)