refactor: rename zitare -> quotes (Zitate)

Zitare was opaque Latin/Italian-flavored branding. Renamed to clear
English "quotes" (DE: Zitate) matching short-concrete-noun cluster.

- Module, routes, API, i18n, standalone landing app, plans dirs
- Dexie tables: quotesFavorites, quotesLists, quotesListTags,
  customQuotes (dropped redundant "quotes" prefix on the last)
- Logo QuotesLogo, theme quotes.css, search provider, dashboard
  widget QuoteWidget
- German user-facing label "Zitate" (English brand stays Quotes)

Pre-launch, no data migration needed.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/CLOUDFLARE_DOMAINS.md

@@ -33,7 +33,7 @@ Diese Domains zeigen noch auf Cloudflare Pages. Um sie auf Self-Hosted umzustell
 |--------|---------|---------------|
 | `chats.mana.how` | CF Pages (`chat-landing`) | Tunnel → `localhost:4400` |
 | `pics.mana.how` | CF Pages (`picture-landing`) | Tunnel → `localhost:4400` |
-| `zitares.mana.how` | CF Pages (`zitare-landing`) | Tunnel → `localhost:4400` |
+| `quotess.mana.how` | CF Pages (`quotes-landing`) | Tunnel → `localhost:4400` |
 | `presis.mana.how` | CF Pages (`presi-landing`) | Tunnel → `localhost:4400` |
 | `clocks.mana.how` | CF Pages (`clocks-landing`) | Tunnel → `localhost:4400` |
 
@@ -106,7 +106,7 @@ Cloudflare Tunnel (bb0ea86d...)
 | `it.mana.how` | IT Souveränität | `/srv/landings/it` |
 | `chats.mana.how` | Chat Landing | `/srv/landings/chat` |
 | `pics.mana.how` | Picture Landing | `/srv/landings/picture` |
-| `zitares.mana.how` | Zitare Landing | `/srv/landings/zitare` |
+| `quotess.mana.how` | Quotes Landing | `/srv/landings/quotes` |
 | `presis.mana.how` | Presi Landing | `/srv/landings/presi` |
 | `clocks.mana.how` | Clock Landing | `/srv/landings/clock` |
 | `cards.mana.how` | Cards Landing | `/srv/landings/cards` |