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Via grants steer routes to specific nodes per viewer. Until now, all clients saw the same routes for each peer because route assembly was viewer-independent. This implements per-viewer route visibility so that via-designated peers serve routes only to matching viewers, while non-designated peers have those routes withdrawn. Add ViaRouteResult type (Include/Exclude prefix lists) and ViaRoutesForPeer to the PolicyManager interface. The v2 implementation iterates via grants, resolves sources against the viewer, matches destinations against the peer's advertised routes (both subnet and exit), and categorizes prefixes by whether the peer has the via tag. Add RoutesForPeer to State which composes global primary election, via Include/Exclude filtering, exit routes, and ACL reduction. When no via grants exist, it falls back to existing behavior. Update the mapper to call RoutesForPeer per-peer instead of using a single route function for all peers. The route function now returns all routes (subnet + exit), and TailNode filters exit routes out of the PrimaryRoutes field for HA tracking. Updates #2180