feat(#211): E3 document library — /docs table, filters, bulk actions, multi-file import, StatusBadge
- StatusBadge component with 6 lifecycle states, compact/full variants, tooltip (#215)
- DocsLibraryPage: table (Name/Status/Stores/Updated), empty state (#211)
- Filter bar: status pills, store chips, debounced search, URL sync (#212)
- Multi-select with sticky bulk bar: Re-chunk, Push to store modal, Delete (#213)
- DocsNewPage: multi-file drop zone with per-file progress, sequential upload (#214)
- Document.stores?: string[] field, formatRelativeTime(iso, locale) helper
- rechunkDocument / pushDocumentToStore API + store actions (rechunk / pushToStore)
- i18n keys status.*, docs.*, docsNew.* in FR + EN
Closes #211, Closes #212, Closes #213, Closes #214, Closes #215
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