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.

presets/factory/bank_2/preset_3.json

@@ -1,11 +1,8 @@
 {
-  "name": "Chorus Bench",
+  "name": "Metal \u2014 New Wave British",
   "bank": 2,
   "program": 3,
-  "master_volume": 0.8,
-  "routing_mode": "mono",
-  "routing_breakpoint": 7,
-  "tuner_enabled": false,
+  "master_volume": 0.78,
   "chain": [
     {
       "fx_type": "noise_gate",
@@ -17,6 +14,27 @@
       "nam_model_path": "",
       "ir_file_path": ""
     },
+    {
+      "fx_type": "nam_amp",
+      "enabled": true,
+      "bypass": false,
+      "params": {
+        "level": 0.75
+      },
+      "nam_model_path": "/root/.pedal/models/JCM2000_Crunch.nam",
+      "ir_file_path": ""
+    },
+    {
+      "fx_type": "ir_cab",
+      "enabled": true,
+      "bypass": false,
+      "params": {
+        "wet": 1.0,
+        "dry": 0.0
+      },
+      "nam_model_path": "",
+      "ir_file_path": "/root/.pedal/irs/british-4x12.wav"
+    },
     {
       "fx_type": "eq",
       "enabled": true,
@@ -30,21 +48,25 @@
       "ir_file_path": ""
     },
     {
-      "fx_type": "chorus",
+      "fx_type": "overdrive",
       "enabled": true,
       "bypass": false,
       "params": {
-        "rate": 0.35,
-        "depth": 0.55,
-        "mix": 0.3,
-        "delay": 5.0,
-        "feedback": 0.1,
-        "waveform": "sine",
-        "spread": 0.5,
-        "phase_invert": false,
-        "high_pass": 20.0,
-        "low_pass": 8000.0,
-        "stereo": true
+        "drive": 0.45,
+        "tone": 0.4,
+        "level": 0.7
+      },
+      "nam_model_path": "",
+      "ir_file_path": ""
+    },
+    {
+      "fx_type": "delay",
+      "enabled": true,
+      "bypass": false,
+      "params": {
+        "time": 0.35,
+        "feedback": 0.2,
+        "mix": 0.25
       },
       "nam_model_path": "",
       "ir_file_path": ""
@@ -54,11 +76,11 @@
       "enabled": true,
       "bypass": false,
       "params": {
-        "level": 0.85
+        "level": 0.82
       },
       "nam_model_path": "",
       "ir_file_path": ""
     }
   ],
   "midi_mappings": {}
-}
+}