feat(decks): Deck-Kategorien über den ganzen Stack

- cards-domain: DECK_CATEGORY_IDS, Labels, DeckCategorySchema,
  category-Feld im DeckSchema
- DB-Schema (decks + marketplace/decks): category-Spalte
- API-Routen: category in create/update/list/explore
- Web: DeckCategoryIcon-Komponente, Kategorie-Picker auf Deck-Detail,
  Kategorie-Icon in DeckListGrid (Marketplace)
- Layout: Bottom-Padding für floating Nav-Bar

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/api/src/db/schema/decks.ts

@@ -16,6 +16,21 @@ export const decks = cardsSchema.table(
 		name: text('name').notNull(),
 		description: text('description'),
 		color: text('color'),
+		category: text('category', {
+			enum: [
+				'language',
+				'medicine',
+				'science',
+				'math',
+				'history',
+				'law',
+				'technology',
+				'arts',
+				'music',
+				'sport',
+				'other',
+			],
+		}),
 		visibility: text('visibility', { enum: ['private', 'space', 'public'] })
 			.notNull()
 			.default('private'),

apps/api/src/db/schema/marketplace/decks.ts

@@ -53,6 +53,21 @@ export const publicDecks = marketplaceSchema.table(
 		description: text('description'),
 		// ISO-639-1 (z.B. 'de', 'en', 'es'). Nullable für mixed-language.
 		language: text('language'),
+		category: text('category', {
+			enum: [
+				'language',
+				'medicine',
+				'science',
+				'math',
+				'history',
+				'law',
+				'technology',
+				'arts',
+				'music',
+				'sport',
+				'other',
+			],
+		}),
 		// SPDX-style ID. CC0-1.0, CC-BY-4.0, CC-BY-SA-4.0,
 		// Cardecky-Personal-Use-1.0 (default für free), Cardecky-Pro-Only-1.0 (paid).
 		license: text('license').notNull().default('Cardecky-Personal-Use-1.0'),

apps/api/src/routes/decks.ts

@@ -37,6 +37,7 @@ export function decksRouter(deps: DecksDeps = {}): Hono<{ Variables: AuthVars }>
 				name: parsed.data.name,
 				description: parsed.data.description,
 				color: parsed.data.color,
+				category: parsed.data.category,
 				visibility: parsed.data.visibility ?? 'private',
 				fsrsSettings: parsed.data.fsrs_settings ?? {},
 				createdAt: now,
@@ -89,6 +90,7 @@ export function decksRouter(deps: DecksDeps = {}): Hono<{ Variables: AuthVars }>
 				...(parsed.data.name !== undefined && { name: parsed.data.name }),
 				...(parsed.data.description !== undefined && { description: parsed.data.description }),
 				...(parsed.data.color !== undefined && { color: parsed.data.color }),
+				...(parsed.data.category !== undefined && { category: parsed.data.category }),
 				...(parsed.data.visibility !== undefined && { visibility: parsed.data.visibility }),
 				...(parsed.data.fsrs_settings !== undefined && {
 					fsrsSettings: parsed.data.fsrs_settings,
@@ -122,6 +124,7 @@ function toDeckDto(row: typeof decks.$inferSelect) {
 		name: row.name,
 		description: row.description,
 		color: row.color,
+		category: row.category,
 		visibility: row.visibility,
 		fsrs_settings: row.fsrsSettings,
 		content_hash: row.contentHash,

apps/api/src/routes/marketplace/decks.ts

@@ -41,6 +41,11 @@ export type MarketplaceDecksDeps = { db?: CardsDb };
 
 const SEMVER_RE = /^(\d+)\.(\d+)\.(\d+)$/;
 
+const MarketplaceCategorySchema = z.enum([
+	'language', 'medicine', 'science', 'math', 'history',
+	'law', 'technology', 'arts', 'music', 'sport', 'other',
+]);
+
 const InitSchema = z.object({
 	slug: z.string(),
 	title: z.string().min(1).max(120),
@@ -51,6 +56,7 @@ const InitSchema = z.object({
 		.optional(),
 	license: z.string().max(60).optional(),
 	priceCredits: z.number().int().min(0).max(100_000).optional(),
+	category: MarketplaceCategorySchema.optional(),
 });
 
 const PatchSchema = z.object({
@@ -59,6 +65,7 @@ const PatchSchema = z.object({
 	language: z.string().regex(/^[a-z]{2}$/).optional(),
 	license: z.string().max(60).optional(),
 	priceCredits: z.number().int().min(0).max(100_000).optional(),
+	category: MarketplaceCategorySchema.optional(),
 });
 
 const CardTypeSchema = z.enum([
@@ -104,6 +111,7 @@ function toDeckDto(row: typeof publicDecks.$inferSelect) {
 		title: row.title,
 		description: row.description,
 		language: row.language,
+		category: row.category,
 		license: row.license,
 		price_credits: row.priceCredits,
 		owner_user_id: row.ownerUserId,
@@ -236,6 +244,7 @@ export function marketplaceDecksRouter(
 				title: parsed.data.title,
 				description: parsed.data.description,
 				language: parsed.data.language,
+				category: parsed.data.category,
 				license,
 				priceCredits,
 				ownerUserId: userId,
@@ -275,6 +284,7 @@ export function marketplaceDecksRouter(
 				...(parsed.data.title !== undefined && { title: parsed.data.title }),
 				...(parsed.data.description !== undefined && { description: parsed.data.description }),
 				...(parsed.data.language !== undefined && { language: parsed.data.language }),
+				...(parsed.data.category !== undefined && { category: parsed.data.category }),
 				...(parsed.data.license !== undefined && { license }),
 				...(parsed.data.priceCredits !== undefined && { priceCredits }),
 			})

apps/api/src/routes/marketplace/explore.ts

@@ -54,6 +54,7 @@ interface DeckListEntry {
 	title: string;
 	description: string | null;
 	language: string | null;
+	category: string | null;
 	license: string;
 	price_credits: number;
 	card_count: number;
@@ -117,6 +118,7 @@ async function browseImpl(
 			title: publicDecks.title,
 			description: publicDecks.description,
 			language: publicDecks.language,
+			category: publicDecks.category,
 			license: publicDecks.license,
 			priceCredits: publicDecks.priceCredits,
 			cardCount: cardCountExpr,
@@ -148,6 +150,7 @@ async function browseImpl(
 			title: r.title,
 			description: r.description,
 			language: r.language,
+			category: r.category,
 			license: r.license,
 			price_credits: r.priceCredits,
 			card_count: Number(r.cardCount),