Update internal/api/server_config.go to use centralized PathRegistry:
Changes:
- Update EnsureLogDirectory() to use config.FromEnv().LogDir() with EnsureDir()
- Update Validate() to use PathRegistry for default BasePath and DataDir
- Remove hardcoded /tmp/ml-experiments default
- Use paths.ExperimentsDir() and paths.DataDir() for consistent paths
Benefits:
- Consistent directory locations via PathRegistry
- Centralized directory creation with EnsureDir()
- Better error handling for directory creation
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