feat: add accelerator daemon process wrapper

[mutianf]

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Fixes #<issue_number_goes_here> 🦕

[gemini-code-assist]

Code Review

This pull request introduces the AcceleratorDaemon class to manage the lifecycle of the Go accelerator daemon subprocess, including spawning the binary, waiting for its Unix domain socket (UDS) to become connectable, and handling teardown. The review feedback identifies several critical robustness and cross-platform compatibility issues: a potential file-locking issue on Windows when cleaning up after a failed spawn, platform-specific errors due to the direct use of socket.AF_UNIX and signal.SIGKILL (which are not supported on all platforms), and a missing cleanup step for self._log_path in _cleanup_tempdir.

[mutianf]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces the AcceleratorDaemon class to manage the lifecycle of the Go accelerator daemon subprocess, including spawning the binary, waiting for its Unix domain socket to become connectable, and performing a graceful teardown. The review feedback suggests several robust improvements: failing fast by checking for AF_UNIX support at the start of the process, preventing resource leaks by handling potential exceptions when opening the log file, wrapping process termination calls to safely handle concurrent exits, and simplifying the polling loop once the socket support check is relocated.