Add guild-specific variant management via Discord commands#237

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Copilot wants to merge 7 commits intomainfrom

copilot/add-variant-management-commands

Commits on Dec 15, 2025

Initial plan
Copilot
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Add variant management infrastructure: migration, repository, use cases, and commands

Copilot
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sonikro
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Add comprehensive tests for variant management use cases and repository

Copilot
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sonikro
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Add guildId to Server model and update repository to support guild-specific variants

Copilot
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sonikro
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Add error handling for guild-specific variants and document limitations

Copilot
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sonikro
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Refactor variant management: remove VariantService, update ConfigManager to use VariantRepository, remove empty_minutes_terminate from user config

Copilot
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sonikro
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Remove getVariantConfig/getVariantConfigs functions and VariantService - all variant config now through VariantRepository

Copilot
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sonikro
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