```

feat(cli): add direct model inference via new run subcommand

- Add `aha run` CLI subcommand for direct model inference without HTTP service
- Support multiple models including Qwen series, OCR models, ASR models, and voice generation
- Implement input/output handling with file path support and auto-generation
- Add comprehensive documentation in CLI_USAGE.md with examples
- Include performance timing for model loading and inference operations
- Add macOS build target to Makefile with Metal support
```

Makefile

@@ -10,6 +10,10 @@ build:
 	@echo "Building project..."
 	@cargo build
 
+build_mac:
+	@echo "Building project for macOS..."
+	@cargo build --features metal  --release
+
 test:
 	@echo "Running tests..."
 	@cargo test