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.

scripts/models/nam/models.txt

@@ -1,10 +1,22 @@
-5150_EVH
-Diezel_VH4
-Engl_Powerball
-Fender_Bassman_59
-Fender_Twin_Clean
-Marshall_JCM800
-Mesa_Boogie_MarkV
-Orange_AD30
-Roland_Jazz_Chorus
+5150_BlockLetter_Boosted
+5152_Lead_TS9
+6505_Red_NoBoost
+BOSS_SD1_Feather
+Bogner_Ecstasy
+Engl_Savage
+Fender_TwinVerb_Clean
+Fender_TwinVerb_Vibrato
+Friedman_PowerAmp_Feather
+JCM2000_Clean
+JCM2000_Crunch
+JCM900_Lead
+Klon_Centaur_High
+MXR_M77_Feather
+Magnatone_Super59_Pushed
+Mesa_MarkIV_Lead
+Orange_Rockerverb
+Precision_Drive_Feather
+Splawn_ProMod_3rd
+TS808_Feather
+TubeScreamer_Maxed
 Vox_AC15_TopBoost