Phases 2-3. Adds a curated AssetGenModelCatalog (image/3D/audio models with
price/duration/use-case metadata; defaults reference the adapter constants so the
panel default equals what an omitted model resolves to). Adds the generate_audio
MCP tool + CLI, threads a per-(kind,provider) selected-model pref so a GUI choice
becomes the default generate_* uses when no model is passed, and makes
Tripo/Meshy consume req.Model. Per-provider prefs (not per-type) so disjoint model
lists never clobber. Compiles on 2021.3 floor; Python + adapter/catalog tests green.
Claude-Session: https://claude.ai/code/session_01GCxmdd4qo7MG6J4M6WcT9Y
Shutong Wu
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