perf: reduce container sizes and build times

- miku-stt: switch PyTorch CUDA -> CPU-only (~2.5 GB savings)
  - Silero VAD already runs on CPU via ONNX (onnx=True), CUDA PyTorch was waste
  - faster-whisper/CTranslate2 uses CUDA directly, no PyTorch GPU needed
  - torch+torchaudio layer: 3.3 GB -> 796 MB; total image 9+ GB -> 6.83 GB
  - Tested: Silero VAD loads (ONNX), Whisper loads on cuda, server ready

- llama-swap-rocm: add root .dockerignore to fix 31 GB build context
  - Dockerfile clones all sources from git, never COPYs from context
  - 19 GB of GGUF model files were being transferred on every build
  - Now excludes everything (*), near-zero context transfer

- anime-face-detector: add .dockerignore to exclude accumulated outputs
  - api/outputs/ (56 accumulated detection files) no longer baked into image
  - api/__pycache__/ and images/ also excluded

- .gitignore: remove .dockerignore exclusion so these files are tracked

stt-realtime/Dockerfile

@@ -1,12 +1,12 @@
 # RealtimeSTT Container
 # Uses Faster-Whisper with CUDA for GPU-accelerated inference
-# Includes dual VAD (WebRTC + Silero) for robust voice detection
+# Includes Silero VAD (ONNX, CPU-only) for robust voice detection
 #
 # Updated per RealtimeSTT PR #295:
 # - CUDA 12.8.1 (latest stable)
-# - PyTorch 2.7.1 with cu128 support
+# - PyTorch CPU-only (for Silero VAD tensor ops only - saves ~2.3 GB)
+# - Faster-Whisper/CTranslate2 uses CUDA directly, no PyTorch GPU needed
 # - Ubuntu 24.04 base
-# - Single Python 3.11 installation
 
 FROM nvidia/cuda:12.8.1-cudnn-runtime-ubuntu24.04
 
@@ -27,7 +27,7 @@ RUN apt-get update && apt-get install -y \
     curl \
     && rm -rf /var/lib/apt/lists/*
 
-# Install PyTorch with CUDA 12.8 support (installed first for layer caching)
+# Install PyTorch CPU-only (for Silero VAD tensor ops - GPU transcription uses CTranslate2 directly)
 COPY requirements-gpu-torch.txt .
 RUN python3 -m pip install --break-system-packages --no-cache-dir -r requirements-gpu-torch.txt
 

stt-realtime/requirements-gpu-torch.txt

@@ -1,5 +1,7 @@
-# PyTorch with CUDA 12.8 support
-# Updated per RealtimeSTT PR #295 for better performance
-torch==2.7.1+cu128
-torchaudio==2.7.1+cu128
---index-url https://download.pytorch.org/whl/cu128
+# PyTorch CPU-only (used solely for Silero VAD which runs on CPU)
+# Silero VAD's OnnxWrapper uses torch tensors internally but does not need GPU.
+# Faster-Whisper/CTranslate2 handles GPU transcription via CUDA directly.
+# torchaudio is required by silero-vad's utils_vad.py top-level import.
+torch==2.7.1+cpu
+torchaudio==2.7.1+cpu
+--index-url https://download.pytorch.org/whl/cpu

stt-realtime/requirements.txt

@@ -9,8 +9,8 @@ ctranslate2>=4.4.0
 # Audio processing
 soundfile>=0.12.0
 
-# VAD - Silero (loaded via torch.hub)
-# No explicit package needed, comes with torch
+# VAD - Silero (loaded via torch.hub, runs on CPU via ONNX)
+# Requires torch (CPU-only) - see requirements-gpu-torch.txt
 
 # Utilities
 aiohttp>=3.9.0