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Phase A plumbing for #188. Adds a users.language column (migration 0022), UserRepo.GetLanguage/SetLanguage, and Session.Lang()/SetLang accessors so future phases can resolve localized content per session instead of falling back to the server-wide config.Language. The preference is loaded from the DB on login and persisted via a new !lang <en|jp|fr|es> chat command that shows the current language when called without an argument, validates the code (case-insensitive), and replies in the newly selected language so the switch is visible immediately. An empty stored value falls back to config.Language. sys_language.go exposes getLangStringsFor(code) as the new dispatch primitive; getLangStrings(server) is now a thin wrapper so existing callers keep working unchanged. isSupportedLang + supportedLangs keep the !lang validator in sync with the dispatcher. Localized quest/scenario content and per-session i18n lookups in existing handlers are deliberately out of scope for phase A — this commit ships only the plumbing so it can be reviewed and deployed independently.