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/PORT_SCHEMA.md

@@ -129,7 +129,7 @@ Pure CRUD apps use mana-sync directly.
 | 5015 | storage-web | 3034 storage-server |
 | 5016 | presi-web | 3040 presi-server |
 | 5017 | food-web | 3038 food-server |
-| 5018 | zitare-web | *(local-first only)* |
+| 5018 | quotes-web | *(local-first only)* |
 | 5019 | photos-web | *(local-first + mana-media)* |
 | 5020 | skilltree-web | *(local-first only)* |
 | 5021 | picture-web | 3035 picture-server |