Immich: Authenticated SVG upload reaches ImageMagick coders and enables RCE

Immich is a high-performance self-hosted photo and video management solution. Prior to 3.2.4, an authenticated non-admin user could upload SVG files that thumbnail-generation code in server/src/repositories/media.repository.ts passed to libvips. Files that bypassed libvips' native SVG loader fell through to ImageMagick, where attacker-controlled <image href> values reached unrestricted MSL and VIDEO coder operations. By storing one crafted asset and referencing its path from a second delayed-marker SVG, an attacker could execute code in the immich-server container when thumbnail processing ran. This issue is fixed in version 3.2.4.