fix: add the arm64 boringssl func sig pattern

[kemingy]

No description provided.

[Copilot]

Pull request overview

This PR extends the TLS probing logic to better support arm64 by introducing architecture-specific BoringSSL byte patterns and refactoring common OpenSSL libssl path candidates into an arch-specific package.

Changes:

• Added internal/arch with per-architecture (amd64/arm64) BoringSSL byte patterns and common libssl candidate paths.
• Updated TLS OpenSSL and BoringSSL probe code to consume arch-specific constants instead of runtime.GOARCH switching.
• Updated README requirements to include arm64.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tls/openssl.go	Uses arch.LibSSLCandidates for OpenSSL libssl autodetection instead of a runtime GOARCH map.
tls/boring.go	Uses arch.BoringSSL{Read,Write}Pattern for byte-pattern matching; removes amd64-only runtime guard.
internal/arch/const_amd64.go	Adds amd64-specific BoringSSL patterns and libssl candidate paths via build tags.
internal/arch/const_arm64.go	Adds arm64-specific BoringSSL patterns and libssl candidate paths via build tags.
README.md	Documents arm64 as a supported runtime architecture.

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