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fix(daemon): filter link-local and loopback addresses in loopEncapIPCheck (#6559)

loopEncapIPCheck blindly used addrs[0] as the encap IP, which could
select an IPv6 link-local (fe80::) or loopback address on dual-stack
nodes when the tunnel interface annotation changes, breaking tunnel
connectivity. Additionally, c.config.Iface was set before validating
the address, causing subsequent polls to skip re-evaluation via the
early-return fast path.

Filter addresses to skip link-local and loopback, and defer the Iface
assignment until a valid encap IP is confirmed.

Signed-off-by: Mengxin Liu <liumengxinfly@gmail.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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