Create translation key system in packages/shared/src/i18n/ with full
English locale covering common actions, all 37 tools, settings sections,
auth, pipeline, and navigation strings. Add useI18n hook that returns
typed translations. Architecture enables adding new languages by
creating locale files matching the TranslationKeys type.
Seven tool route files using the createToolRoute factory, registering 10 API
endpoints total (color adjustments covers 4 tool IDs). Also fixes the tool
factory generic to properly infer Zod output types and clamps the compress
binary-search quality to 1-100.