Upgrade to ROCm 7.2, Python 3.11, PyTorch 2.11.0

- Base image: rocm/dev-ubuntu-22.04:6.1 → 7.2
- Python 3.10 → 3.11 via deadsnakes PPA
- torch/torchaudio: 2.5.1 → 2.11.0
- torchvision: 0.20.1 → 0.26.0
- pytorch_triton_rocm: 3.1.0 → 3.3.0
- transformers: 4.46.3 → >=4.50.0
- diffusers: 0.29.0 → >=0.32.0
- safetensors: >=0.4.1 → >=0.4.5
- config: temperature 0.8→0.9, seed 0→1960

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

config.yaml

@@ -13,11 +13,11 @@ tts_engine:
 generation_defaults:
   # Turbo model: uses temperature only (exaggeration/cfg_weight ignored)
   # Standard model: uses exaggeration and cfg_weight (temperature ignored)
-  temperature: 0.8
+  temperature: 0.9
   exaggeration: 0.5
   cfg_weight: 0.5
   # seed: 0 = random each call, >0 = reproducible output
-  seed: 0
+  seed: 1960
 
 wyoming:
   host: "0.0.0.0"