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>

packages/shared-theme/src/app-routes.ts

@@ -129,8 +129,8 @@ export const APP_ROUTES: Record<string, AppRouteConfig> = {
 		],
 	},
 
-	zitare: {
-		appId: 'zitare',
+	quotes: {
+		appId: 'quotes',
 		defaultRoute: '/',
 		availableRoutes: [
 			{ path: '/', label: 'Zitate', icon: 'quote', alwaysVisible: true },