feat: Speiseplan-Inhalte variabel mehrsprachig (Teil 2)

Gerichtnamen, Essenszeiten und Allergen-/Zusatzstoff-Bezeichnungen sind
jetzt genauso dynamisch mehrsprachig wie die Bedienoberfläche aus
v1.10.0, statt fest auf Englisch/Polnisch begrenzt zu sein. Neue
Übersetzungstabellen ersetzen die alten name_en/name_pl-Spalten,
DeepL-Auto-Übersetzung und CSV-Import/-Export unterstützen jetzt
beliebig viele aktive Sprachen.

app/api/dishes/route.ts

@@ -1,12 +1,35 @@
 import { NextResponse } from "next/server";
 import { query, queryOne } from "@/lib/db";
+import { loadTranslationsFor, replaceTranslations } from "@/lib/db/translations";
 import { authErrorResponse, requireRole } from "@/lib/auth/session";
 import { isSameOrigin } from "@/lib/origin";
 import type { Dish } from "@/lib/types";
 
+interface DishRow {
+  id: string;
+  name: string;
+  price: string;
+  allergens: string[];
+  additives: string[];
+}
+
+async function withTranslations(rows: DishRow[]): Promise<Dish[]> {
+  const translations = await loadTranslationsFor(
+    "dish_translations",
+    rows.map((r) => r.id)
+  );
+  return rows.map((r) => ({
+    ...r,
+    price: Number(r.price),
+    translations: translations.get(r.id) ?? {},
+  }));
+}
+
 export async function GET() {
-  const dishes = await query<Dish>("select * from dishes order by name");
-  return NextResponse.json(dishes);
+  const rows = await query<DishRow>(
+    "select id, name, price, allergens, additives from dishes order by name"
+  );
+  return NextResponse.json(await withTranslations(rows));
 }
 
 export async function POST(request: Request) {
@@ -17,17 +40,20 @@ export async function POST(request: Request) {
     await requireRole(["staff", "admin"]);
     const body = (await request.json()) as {
       name: string;
-      name_en: string | null;
-      name_pl: string | null;
       price: number;
       allergens: string[];
       additives: string[];
+      translations?: Record<string, string | null>;
     };
-    const dish = await queryOne<Dish>(
-      `insert into dishes (name, name_en, name_pl, price, allergens, additives)
-       values ($1, $2, $3, $4, $5, $6) returning *`,
-      [body.name, body.name_en, body.name_pl, body.price, body.allergens, body.additives]
-    );
+    const row = (await queryOne<DishRow>(
+      `insert into dishes (name, price, allergens, additives)
+       values ($1, $2, $3, $4) returning id, name, price, allergens, additives`,
+      [body.name, body.price, body.allergens, body.additives]
+    ))!;
+    if (body.translations) {
+      await replaceTranslations("dish_translations", row.id, body.translations);
+    }
+    const [dish] = await withTranslations([row]);
     return NextResponse.json(dish, { status: 201 });
   } catch (err) {
     const res = authErrorResponse(err);