Subnetlens 1.0.0-beta.7 (signed)

First code-signed Subnetlens release — the installer and app are now signed by HELIOSOFT LTD via Azure Trusted Signing, so Windows no longer shows "Unknown Publisher" (SmartScreen reputation will warm up over the next clean installs).

Also adds an in-app Get Pro link to the website on the free-tier upgrade screens.

SHA-256 (Subnetlens-Setup-1.0.0-beta.7.exe):
D572A90860FB313AEE5C26D4A2DF88A72617C088D2C28BBBBE4D31B501D31E34