refactor(shared): centralize configuration and types
Migrate configuration validation and core moderation types from individual services to the `@bete/shared` package to ensure consistency across the monorepo. - Move `AppConfig` and moderation-related interfaces to `packages/shared`. - Replace service-specific Zod schemas with the centralized shared configuration. - Refactor `services/backend` and `services/discord-gateway` to consume shared config and types. - Remove redundant type definitions and local configuration logic in services. - Update `packages/shared` exports to include new `config` and `moderation-types` modules. - Clean up unused files and deprecated utility functions in `packages/shared`.
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