fix: raise speed minimum from 0.1 to 0.3 to prevent VRAM explosion

Speed values below 0.3 produce noise, and 0.1 generates 10x the normal
audio length which can consume 20+ GB VRAM and freeze the system.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

nodes/generator.py

@@ -116,8 +116,8 @@ class OmniVoiceGenerate:
                     ),
                 }),
                 "speed": ("FLOAT", {
-                    "default": 1.0, "min": 0.1, "max": 3.0, "step": 0.1,
-                    "tooltip": "Playback speed multiplier. 1.0 = normal, >1.0 = faster, <1.0 = slower.",
+                    "default": 1.0, "min": 0.3, "max": 3.0, "step": 0.1,
+                    "tooltip": "Playback speed multiplier. 1.0 = normal, >1.0 = faster, <1.0 = slower. Below 0.3 produces noise and extreme VRAM usage.",
                 }),
                 "num_step": ("INT", {
                     "default": 32, "min": 1, "max": 100,