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/sections/route.ts

@@ -1,12 +1,30 @@
 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 { Section } from "@/lib/types";
 
+interface SectionRow {
+  key: string;
+  label: string;
+  time_range: string;
+  sort: number;
+}
+
+async function withTranslations(rows: SectionRow[]): Promise<Section[]> {
+  const translations = await loadTranslationsFor(
+    "section_translations",
+    rows.map((r) => r.key)
+  );
+  return rows.map((r) => ({ ...r, translations: translations.get(r.key) ?? {} }));
+}
+
 export async function GET() {
-  const sections = await query<Section>("select * from sections order by sort");
-  return NextResponse.json(sections);
+  const rows = await query<SectionRow>(
+    "select key, label, time_range, sort from sections order by sort"
+  );
+  return NextResponse.json(await withTranslations(rows));
 }
 
 export async function POST(request: Request) {
@@ -17,19 +35,22 @@ export async function POST(request: Request) {
     await requireRole(["staff", "admin"]);
     const body = (await request.json()) as {
       label: string;
-      label_en: string | null;
-      label_pl: string | null;
       time_range: string;
+      translations?: Record<string, string | null>;
     };
 
     const maxRow = await queryOne<{ sort: number }>(
       "select sort from sections order by sort desc limit 1"
     );
-    const section = await queryOne<Section>(
-      `insert into sections (label, label_en, label_pl, time_range, sort)
-       values ($1, $2, $3, $4, $5) returning *`,
-      [body.label, body.label_en, body.label_pl, body.time_range, (maxRow?.sort ?? 0) + 1]
-    );
+    const row = (await queryOne<SectionRow>(
+      `insert into sections (label, time_range, sort)
+       values ($1, $2, $3) returning key, label, time_range, sort`,
+      [body.label, body.time_range, (maxRow?.sort ?? 0) + 1]
+    ))!;
+    if (body.translations) {
+      await replaceTranslations("section_translations", row.key, body.translations);
+    }
+    const [section] = await withTranslations([row]);
     return NextResponse.json(section, { status: 201 });
   } catch (err) {
     const res = authErrorResponse(err);