Update flashgrep workspace search integration - #1299

Summary

• update bundled flashgrep binaries and metadata to v0.2.10
• adapt workspace search protocol types to the current flashgrep daemon response shape
• prefer musl Linux flashgrep binaries and ignore local flashgrep index data

Verification

• cargo check -p bitfun-services-integrations --features workspace-search
• manual stdio probe with resources/flashgrep/flashgrep-aarch64-apple-darwin: initialize, open_repo, search, glob