feat(nam): download 10 new A2 models for bass, orange, and other missing categories

Bank 7 — Bass: Ampeg PF20T, Aguilar Tone Hammer 500, GK 800RB (Gallien-Krueger), Aguilar DB751
Bank 7 — Orange: Orange Rocker 30 Dirty + Natural
Bank 7 — Others: Fender Bassman dimed, Hiwatt DR103 Bright + Cornish, Supro Black Magick M3

All SlimmableContainer v0.7.0, ~287-295 KB, verified JSON.
Also fixed Bank 2 Tone3000 storage keys to include .nam extension (Tone3000 changed URL format).
Inventory updated: 54 → 64 total models.

src/web/ui-dist/img/fx_gate.svg

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