fix: enforce public board voting setting

[Nameless-Monster-Nerd]

Description

Reject public-board vote creation when the board has voting disabled. This applies the same feature-flag enforcement already used by public comments and reactions, before any IssueVote is created.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Improvement (change that would cause existing functionality to not work as expected)
• Code refactoring
• Performance improvements
• Documentation update

Screenshots and Media (if applicable)

Not applicable; this is an API behavior fix.

Test Scenarios

• pytest plane/tests/unit/views/test_issue_vote_public.py -vv
• ruff check plane/space/views/issue.py plane/tests/unit/views/test_issue_vote_public.py
• ruff format --check plane/space/views/issue.py plane/tests/unit/views/test_issue_vote_public.py

References

Closes #9500

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