feat(06-01): add yt-dlp and anthropic dependencies

- Add yt-dlp>=2025.0.0 and anthropic>=0.40.0 to pyproject.toml
- Wire ANTHROPIC_API_KEY env var in docker-compose.prod.yml (empty default)
- Rebuilt Docker image, both packages importable in container

pyproject.toml

@@ -17,6 +17,8 @@ dependencies = [
     "numpy>=1.26.0",
     "librosa>=0.10.0",
     "python-multipart>=0.0.9",
+    "yt-dlp>=2025.0.0",
+    "anthropic>=0.40.0",
 ]
 
 [project.optional-dependencies]