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>

scripts/validate-dockerfiles.mjs

@@ -112,7 +112,7 @@ function getDockerfileCopyPaths(dockerfilePath) {
 	for (const line of lines) {
 		const trimmed = line.trim();
 		// Match COPY statements like: COPY packages/shared-utils ./packages/shared-utils
-		// or COPY apps/zitare/packages/content ./apps/zitare/packages/content
+		// or COPY apps/quotes/packages/content ./apps/quotes/packages/content
 		// or COPY services/mana-auth ./services/mana-auth
 		const copyMatch = trimmed.match(/^COPY\s+((?:packages|apps|services)\/\S+)/);
 		if (copyMatch) {