feat: vault-aligned server v1 + UX polish

Redesign the optional FastAPI companion around vault files (manifest /
PUT/GET/DELETE + OCR jobs) instead of legacy strokes_json notes. Wire a
client Server settings panel for health/login. Polish shell UX: l10n for
settings/home/board, sticky-board empty state, and a narrow-screen
diagnostics FAB.

Co-authored-by: Cursor <cursoragent@cursor.com>

README.md

@@ -12,7 +12,9 @@ All notes, documents, search, and OCR run on your device. No server is required
 - Infinite sticky board with `[[wikilinks]]` / backlinks
 - Full-text search over note titles, typed text, and OCR results
 - Always-on diagnostics + one-click diagnostic pack export (Settings)
+- Optional self-hosted **BadNote Server** (`/api/v1`: vault assist + OCR jobs) — see [server/README.md](server/README.md)
 - **Local OCR** — ONNX when bundled, else Windows WinRT
+- WebDAV vault sync (NAS)
 
 ## Build (Windows)