fix(fastdl): include Source resource files

[BreezeDelegate]

Description

Include the Source resource directory in FastDL and copy its mixed client assets instead of looking for the non-existent resources directory.

Fixes #3992

Type of change

• Bug fix (a change which fixes an issue).
• New feature (a change which adds functionality).
• New Server (new server added).
• Refactor (restructures existing code).
• Comment update (typo, spelling, explanation, examples, etc).

Testing

• Commands/tests run: isolated fn_fastdl_preview and fn_fastdl_source fixtures; bash -n; npx prettier --check lgsm/modules/command_fastdl.sh; ShellCheck
• Result: preview and copy both handled 3/3 mixed resource files; all checks passed
• Environment used (distro/version): Ubuntu 24.04

Risk and rollback

• Risk level: low
• Rollback plan: revert this change

Breaking changes

• No breaking changes.
• Breaking changes included (describe below).

Documentation impact

• No documentation update required.
• User documentation update required.
• Developer documentation update required.

Checklist

• This pull request links to an issue.
• This pull request uses the develop branch as its base.
• This pull request subject follows the Conventional Commits standard.
• This code follows the style guidelines of this project.
• I have performed a self-review of my code.
• I have provided a detailed enough description of this PR.

[Copilot]

Pull request overview

This PR fixes FastDL packaging for Source engine servers by including the correct resource/ directory (not the non-existent resources/) and ensuring its client assets are copied into the FastDL output.

Changes:

• Update the Source FastDL directory list to use resource instead of resources.
• Treat resource/ as “copy all files” (-iname "*") during both preview and copy steps.

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