feat: PRSDM-10268 enforce imports

[christopherbrunsdon]

Description

Enforce imports in the correct order

How to Test

1. Build the package

2. In a Presidium module, set the order in reverse

3. Run presidium hugo against this module (reference the absolute path from your module)

$ presidium hugo

ERRO[0000] invalid module import order: "github.com/spandigital/presidium-styling-base"
(index 1) must come before "github.com/spandigital/presidium-layouts-base" (index 0).

Fix config.yaml: list github.com/spandigital/presidium-styling-base before 
github.com/spandigital/presidium-layouts-base.  file="presidium/cmd/hugo.go:23"

4. Correct the order: base before layouts

5. Run presidium hugo against this module

$ presidium hugo

Start building sites …
...

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Ticket

https://spandigital.atlassian.net/browse/PRSDM-9466

[Copilot]

Pull request overview

Adds a Hugo config validation step to enforce deterministic Hugo module import ordering (styling base before layouts base), along with supporting config parsing and tests.

Changes:

• Add validateModuleImportOrder to the Hugo service and run it before invoking Hugo.
• Introduce configtranslation.ReadHugoConfig to parse Hugo YAML config into HugoConfig.
• Add unit tests for module import ordering validation and update README build/test prerequisites (submodules).

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 5 comments.

File	Description
pkg/domain/service/hugo/hugo.go	Adds config discovery and import-order validation prior to running Hugo.
pkg/domain/service/hugo/hugo_test.go	Adds unit tests for the new import-order validation behavior.
pkg/configtranslation/configfile.go	Adds a ReadHugoConfig helper to read/unmarshal Hugo config YAML.
README.md	Documents initializing git submodules before building/testing.

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[Zalaras]

LGTM, not tested locally