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Add a tsdial.Dialer.UserDialPlan method that resolves an address and reports whether the dialer would route it via Tailscale. The LocalAPI /dial handler now uses this to skip proxying for addresses that aren't Tailscale routes (e.g. localhost), returning a Dial-Self response with the resolved address so the client can dial it directly. This avoids an unnecessary round-trip through the daemon for local connections. The client's UserDial handles the new response by dialing the resolved address itself, and the server passes the pre-resolved IP:port for Tailscale dials to avoid redundant DNS lookups. Updates tailscale/corp#39702 Change-Id: I78d640f11ccd92f43ddd505cbb0db8fee19f43a6 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>