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* feat(gallery): read metadata for system-path backends, enabling variant aliases Problem: - ListSystemBackends only read metadata.json for user-managed backends; the system-path scan (LOCALAI_BACKENDS_SYSTEM_PATH) was a bare directory walk with Metadata hardcoded nil - system-packaged backends (distro packages installing several accelerator builds of one backend) could not declare aliases or meta indirection at all, while gallery-installed backends could - surfaced while packaging LocalAI for Gentoo: the packages install cpu-/rocm-/vulkan-audio-cpp as system backends aliased to audio-cpp, which the server ignored Change: - scan each root separately, clean the system collection against the user-managed one, merge, then build and resolve — precedence lives in one explicit step - alias candidates carry their own metadata: the resolved alias entry can never pair one installation's executable with another's metadata, and it reports the chosen candidate's origin (IsSystem) - deterministic resolution: entries build in sorted name order and candidates sort by name at the resolution site, independent of scan order Precedence (user-managed always wins): - a user-managed backend hides a same-named system backend entirely - a user-managed variant takes over its whole alias family: the alias resolves among user-managed variants only and the system family's concrete names disappear — family versions move together, and a stale system variant may not work with newer models, so it must not stay reachable - a system variant's alias never hijacks a name that exists as a user-managed backend Tests: Ginkgo regressions for system-path aliasing, same-name hiding, family takeover, and the full metadata permutation matrix of cross-root name collisions (both directions, with and without metadata on each side). Docs: new "Backend Directory Format" section (run.sh, metadata.json, alias resolution — previously undocumented for user-managed backends too) and "System-Provided Backends" with the precedence rules. Assisted-by: Claude:claude-fable-5 Signed-off-by: Plamen K. Kosseff <p.kosseff@gmail.com> * fix(gallery): preserve managed meta backends A system alias can replace a user-managed meta backend during discovery. Protect meta entries with the same precedence guard as concrete backends. Add a regression test and clarify the documented precedence. Assisted-by: Codex:GPT-6 Signed-off-by: Plamen K. Kosseff <p.kosseff@gmail.com> --------- Signed-off-by: Plamen K. Kosseff <p.kosseff@gmail.com> Co-authored-by: localai-org-maint-bot <306269227+localai-org-maint-bot@users.noreply.github.com>