v3.12.2 — bump audiolla v1.0.6 → v1.0.7

Patch release. Upstream UX + bug-fix tag — no API contract removed.

  - Field-name aliases on /v1/audio/{fade,eq,similar}.
  - /v1/audio/master mode optional (auto-detected from request).
  - POST /v1/presets/{name} + POST /v1/pipeline migrated from
    Form/File to JSON body. New PresetRunRequest / PipelineRunRequest
    schemas; pipeline steps now typed list[{op, params?}].
  - Global JSON 500 envelope (uncaught exceptions now return JSON
    instead of plain text).
  - /v1/audio/remix accepts linear-gain shorthand.
  - UVR phantom-output diagnostic improved.

aigate-side: image-tag bump only. test_audiolla.sh 14/14 green
(suite does not exercise any of the changed endpoints).