Feat/gendoc router fix type validation

[frostnzx]

Issue ID/Name

Fix type validation in gendoc router

Description

• Mostly add enum validation to projectId or userId
• Decided to change type parameter in createGendoc to enum to match subType

Checklist

• I have self-reviewed my code.
• I have commented on my code, particularly in the hard-to-understand area.
• New and existing unit tests pass locally with my change.
• I have tagged a reviewer for this PR.
• (Should Be) I have NOT committed the modified environment/config file(s) to this PR.