feat(workspace): follow imports configured in qbxlint.toml

[loaf-scripts]

Changes

Language server support for imports in qbxlint.toml (Qbox-project/qbx-lua#6), which lists files resources run without an fxmanifest.lua entry.

• Diagnostics: resource environments are built with qbx-lint's shared resource_imports and ResourceEnv::add_import, so the editor reports the same globals as the CLI.
• Definitions, hover and completion reach the globals of imported files: configured imports are linked like manifest imports, with their side.
• Glob patterns are resolved against indexed files. Paths are compared normalized, since open documents keep the path spelling the editor sent.
• Imports are linked again when qbxlint.toml changes and when a new Lua file appears, since it may match a glob.
• A resource outside the workspace that only imports names is indexed on the next qbx/reindex or restart, like manifest dependencies.
• docs/protocol.md describes when import changes apply.

Depends on Qbox-project/qbx-lua#6. CI builds against qbx-lint's main, so this PR will not compile there until that PR is merged.

Checks

• cargo fmt --check, cargo clippy --all-targets (no warnings) and cargo test pass on Windows, built against the qbx-lint branch checked out next to this repo. Not run on Linux locally.
• New test in tests/workspace_refresh.rs covering globals by side, a resource the override does not cover, definitions reaching the imported file, and the imports going away when the config is removed.

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