Allow link-local integration URLs on self-hosted instances

[Freika]

Self-hosters reaching Immich via Podman host-gateway (link-local 169.254.x) were wrongly blocked as SSRF. Move 169.254.0.0/16 to the cloud-only blocklist, keep the cloud-metadata /32 blocked everywhere, and log the resolved IP on rejection.

Fixes #3005

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