Feature Flags Module

No caching. Every isFlagEnabled() and hasAccess() call hits the database directly.
isFlagEnabled(flagName) checks global on/off state. hasAccess(flagName, context) checks both global state AND per-entity access records (guild, user, or role).
Access logic: flag must be globally enabled AND user must have an explicit access grant. Grants can target guildId, userId, or roleId independently.
Commands declare beta: true and optionally featureFlag: string in the Command interface. CommandHandler intercepts beta commands and calls hasAccess() before execution.
If a command has no explicit featureFlag, the command name (interaction.commandName) is used as the flag name fallback.
Flag names are case-sensitive. Convention is snake_case or camelCase — no enforcement.
Admin management via /featureflags command: CRUD on flags and access grants/revokes.