The eager `import.meta.glob` was statically pulling all 13 locale JSON
files into the main bundle, defeating the sibling lazy glob and emitting
INEFFECTIVE_DYNAMIC_IMPORT warnings. Statically import only the en-US
fallback, lazy-load the rest, and await `readyI18n()` in each entry
before mount so the first paint still uses the active locale.
New /panel/api-docs route with a one-page reference covering every
/panel/api/* endpoint (Auth, Inbounds, Server, Nodes, Custom Geo,
Backup) plus a Bearer-token primer that reads the current token and
exposes Show/Copy/Regenerate inline. Sidebar gets an API Docs entry
right after Xray; the menu label is shared via menu.apiDocs across all
13 locales.
