Fix/216 double bet overwrite

[Jayydy]

Summary

Brief description of what this PR does.

setup() now returns 6-tuple including admin, uses mock_all_auths_allowing_non_root_auth()
initialize() now bootstraps all roles (FeeSetter, Resolver, Pauser) to admin so standalone tests work without manual role assignment
create_market no longer double-calls require_auth (removed redundant call since require_role already handles it)
All test helpers and standalone tests updated to use admin as creator and pass correct caller args
Double-bet test amounts updated to use LMSR-scale values (5_000_000 instead of 50)

Related Issue

Closes #309

Type of Change

• [x ] Bug fix
• New feature
• Refactor
• Documentation update
• Other (describe):

Changes Made

Testing

Describe how you tested your changes.

Checklist

• [ x] My code follows the project's style guidelines
• [ x] I have performed a self-review of my code
• [x ] I have commented complex logic where necessary
• [x ] I have updated documentation if needed
• [ x] My changes don't introduce new warnings or errors

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[Hahfyeex]

@Jayydy resolve conflicts