feat(install): support hosted tree URLs for git sources

[peter-jerry-ye]

Summary

• add hosted tree URL parsing for binary install source
• support GitHub and GitCode tree URL forms and map them into git URL + optional branch + optional path-in-repo
• wire parsed tree URL components into git install dispatch
• reject ambiguous input when source already contains a tree path and PATH_IN_REPO is also provided
• add unit tests for hosted tree URL parsing and update install reference docs

Supported source forms

• https://github.com///tree//<path...>
• https://gitcode.com///tree//<path...>
• https://gitcode.com///-/tree//<path...>

Notes

This PR is stacked on top of PR #1501 and should be reviewed after it.

Testing

• cargo test -p moon install_binary
• cargo test -p moon deps::tests

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
crates/mooncake/src/pkg/install.rs	26% smaller
crates/moon/src/cli/deps.rs	14% smaller
crates/moon/src/cli/install_binary.rs	12% smaller
crates/moon/tests/test_cases/mod.rs	9% smaller
crates/moon/tests/test_cases/moon_commands/shell_completion_bash.stdout	Unsupported file format
crates/moon/tests/test_cases/moon_commands/shell_completion_elvish.stdout	Unsupported file format
crates/moon/tests/test_cases/moon_commands/shell_completion_fish.stdout	Unsupported file format
crates/moon/tests/test_cases/moon_commands/shell_completion_powershell.stdout	Unsupported file format
crates/moon/tests/test_cases/moon_commands/shell_completion_zsh.stdout	Unsupported file format
docs/dev/reference/moon-install-binary.md	Unsupported file format
docs/dev/reference/readme.md	Unsupported file format
docs/manual-zh/src/commands.md	Unsupported file format
docs/manual/src/commands.md	Unsupported file format

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Handle slash-containing refs in hosted tree URLs

This parser assumes the ref is always after_tree[0], so URLs like .../tree/feature/new-ui (a valid branch/tag name containing /) are misinterpreted as ref feature plus path_in_repo new-ui. In that case moon install will either check out the wrong ref or fail with a missing-path error, even though the copied hosted tree URL is valid; this affects common branch naming conventions such as feature/... and release/....

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