Wire `@pracht/i18n`: locale-detection middleware (URL prefix, cookie,
`Accept-Language`), lazy typed dictionaries, and either strategy —
locale-prefixed route groups with hreflang, or one URL per page with a
cookie-backed switcher.
Use for "add i18n", "set up translations", "make my app multilingual", "add
locale routing", "switch language without changing URLs", "extract strings".
