feat(config): add imports for files loaded without an fxmanifest entry

[loaf-scripts]

Changes

Some resources run code from another resource without an fxmanifest.lua entry, for example a shared library whose loader calls load(LoadResourceFile(...)) for each of its files. The linter cannot follow that, so every global those files define is reported as undefined-global in the resources that use them. Listing them under globals means naming each one by hand and losing the client/server checks.

imports lists those files as @resource/path patterns, grouped by the side they run on. Each resource then sees their globals as if its manifest imported them:

[imports]
shared = ["@my_lib/shared/**.lua"]
client = ["@my_lib/client/**.lua"]
server = ["@my_lib/server/**.lua", "@oxmysql/lib/MySQL.lua"]

# Or only for some resources: an override's imports apply to each resource
# whose fxmanifest.lua its `files` patterns match
[[overrides]]
files = ["resources/[[]my_lib[]]/**"]

[overrides.imports]
shared = ["@my_lib/shared/**.lua"]

• Patterns follow fxmanifest globs: * stays within a folder, ** crosses folders, and case is ignored.
• Server scripts do not see the globals of client imports, and client scripts do not see those of server imports.
• Well-known imports such as @oxmysql/lib/MySQL.lua keep their built-in globals when the resource is not installed. Any other pattern that matches no file is reported like an unresolved manifest import.
• A pattern that is not an @resource/path Lua pattern stops the config from loading, with an error naming it.
• Documented under "Runtime imports" in docs/reference.md; examples/qbxlint.toml shows the new table.

Implementation:

• resource_imports (manifest plus configured imports) and ResourceEnv::add_import in project.rs replace the add_import free function. qbx-lua-ls uses them too, so both build the same environment; only resolving a pattern to files differs (disk here, the index there).
• ResourceLocator keeps each imported file's parsed summary, so a library imported by many resources is parsed once per run.
• Side effect: manifest imports with globs, such as @res/client/*.lua, are now followed instead of reported as unresolved.

Language server support: Qbox-project/qbx-lua-ls#6

Checks

• cargo fmt --check, cargo clippy --all-targets (no warnings) and cargo test pass on Windows. Not run on Linux locally.
• New tests: parsing, validation and override matching in config.rs; an end-to-end CLI test in tests/cli.rs covering sides and a resource the override does not match.
• On a 25-resource server whose shared library is loaded through load(LoadResourceFile(...)), undefined-global went from 349 to 25 with the same run time (about 0.5 s). The remaining reports come from escrowed resources and unrelated third-party code.

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