auth: ensure that routes are autoapproved when the node is stored

[kradalby]

Fixes #2547

[ghost]

Pull Request Revisions

Revision	Description
r2	Route auto-approval workflow updated Modified route auto-approval to save node after policy check, ensuring routes are properly processed and updates are sent
r1	Route auto-approval workflow refactored Modified route auto-approval process to handle database and policy manager interactions more explicitly, adding a save and notification step after route approval

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[ghost]

In hscontrol/auth.go, auto-approval of routes was removed from handleRegisterInteractive but still exists in handleRegisterWithAuthKey (line 217). Should this also be moved to after the node is stored in the database for consistency with the other registration flows?

[nblock]

Manual test with routes and exit nodes worked, thx!