Allow agreement signing via Hudu secure links

End users have requested the ability to sign agreements directly from a Hudu secure link. We would like to see this in Hudu.

Currently, secure links are used to share sensitive information with external parties or request password information to be filled out, but there is no way to collect a signature or acknowledgment from the recipient within that same flow.

Adding signature support to secure links would allow MSPs to send agreements, SOWs, acceptable use policies, or similar documents and collect a signed response without requiring a third-party e-signature tool.