feat: strengthen C# edit workflow

[akiojin]

Summary

• strengthen the C# edit workflow so write tools use LSP by default and return a unified structured result
• add write_csharp_file, create_csharp_file, apply_csharp_edits, plus singular project/package setting APIs
• harden Unity batch/test behavior by skipping the TCP listener in batch/test processes and aligning EditMode test discovery

Testing

• cargo clippy --all-targets -- -D warnings
• cargo test --all-targets
• dotnet test lsp/Server.Tests.csproj
• dotnet build UnityCliBridge/UnityCliBridge.Editor.csproj
• dotnet build UnityCliBridge/UnityCliBridge.Tests.csproj
• Unity EditMode tests: 145 total / 139 passed / 0 failed / 6 skipped

Fixes #107

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[akiojin]

LSP Performance failure was caused by a transient GitHub release fetch error during unity-cli lsp install.

Fixed in 2403a6a:

• retry transient 5xx and transport errors when fetching the csharp-lsp manifest in src/lsp_manager.rs
• add unit coverage for 500->200 recovery and repeated 500 failure
• merge the remote PR branch head so CI reruns on the current branch state

Verified locally:

• cargo fmt --all -- --check
• cargo clippy --all-targets -- -D warnings
• cargo test --all-targets
• cargo build --release
• ./target/release/unity-cli lsp install --output json

CI is running again on PR #108.