fix: Dockerfile uses explicit pip install, skip pre-installed packages

Removed librosa (unused), torch, pyyaml from install list since
they're in the base image. Avoid numpy rebuild conflict.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

kischdle/llmux/requirements.txt

@@ -3,22 +3,18 @@ fastapi>=0.115.0
 uvicorn[standard]>=0.34.0
 python-multipart>=0.0.18
 
-# AI runtimes
-torch>=2.7.0
+# AI runtimes (torch pre-installed in base image)
 transformers>=5.4.0
-llama-cpp-python>=0.3.0
 chatterbox-tts>=0.1.0
 
 # Audio processing
 soundfile>=0.12.0
-librosa>=0.10.0
 
-# Config & utilities
-pyyaml>=6.0
+# Config & utilities (pyyaml pre-installed in base image)
 sentencepiece>=0.2.0
 protobuf>=5.0.0
 
-# Testing
+# Testing (only needed for development)
 pytest>=8.0.0
 pytest-asyncio>=0.24.0
 httpx>=0.28.0