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/SETUP_TEMPLATES.md

@@ -410,7 +410,7 @@ mana-web:
 | 3001 | mana-auth |
 | 3002 | chat-backend |
 | 3006 | picture-backend |
-| 3007 | zitare-backend |
+| 3007 | quotes-backend |
 | 3009 | cards-backend |
 | 3015 | contacts-backend |
 | 3016 | calendar-backend |
@@ -423,7 +423,7 @@ mana-web:
 |------|---------|
 | 5173 | mana-web |
 | 5175 | picture-web |
-| 5177 | zitare-web |
+| 5177 | quotes-web |
 | 5179 | calendar-web |
 | 5184 | contacts-web |
 | 5186 | calendar-web (staging) |