refactor: clarify desktop-managed backend markers

[zouyonghe]

Summary

• Rename the packaged backend marker helper to mark_as_desktop_managed.
• Extract the desktop-managed enabled marker value into a constant.
• Update the regression test name and assertions to use the shared constants.

Why

This addresses review feedback on the desktop-managed backend startup marker code and reduces the chance of typos in the marker values.

Verification

• cargo test mark_as_desktop_managed_sets_desktop_management_markers
• cargo test backend::launch
• cargo fmt -- --check
• cargo test

Notes

• cargo clippy --all-targets -- -D warnings currently fails on macOS due to pre-existing dead_code warnings for Linux-only WebKit workaround symbols in src/app_runtime.rs; this PR does not touch that file.

Summary by Sourcery

Clarify and standardize how the backend is marked as desktop-managed when running in packaged mode.

New Features:

• Introduce a mark_as_desktop_managed helper to apply desktop management environment markers in one place.

Enhancements:

• Extract the enabled environment marker value into a shared constant to avoid hard-coded literals.
• Align related tests and test names with the new helper and shared constant for desktop-managed markers.

[sourcery-ai]

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[gemini-code-assist]

Code Review

This pull request refactors the environment configuration for the desktop managed backend. Specifically, it introduces a new constant ENABLED_ENV_VALUE to replace hardcoded "1" values, and renames the function configure_desktop_managed_environment to mark_as_desktop_managed along with its corresponding tests. There are no review comments, and I have no feedback to provide.

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