feat: implement meal planning feature with CRUD operations and UI integration

frontend/app/api/meal-plan-proxy/route.ts

@@ -0,0 +1,40 @@
+import { NextRequest, NextResponse } from 'next/server';
+
+const API_BASE = process.env.NEXT_PUBLIC_API_URL_INTERNAL || 'http://recipe-api:8080';
+
+export async function GET(request: NextRequest) {
+  const { searchParams } = request.nextUrl;
+  const query = searchParams.toString();
+  const res = await fetch(`${API_BASE}/api/meal-plan${query ? `?${query}` : ''}`, {
+    cache: 'no-store',
+  });
+  const text = await res.text();
+  return new NextResponse(text, {
+    status: res.status,
+    headers: { 'Content-Type': 'application/json' },
+  });
+}
+
+export async function POST(request: NextRequest) {
+  const body = await request.text();
+  const res = await fetch(`${API_BASE}/api/meal-plan`, {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body,
+    cache: 'no-store',
+  });
+  const text = await res.text();
+  return new NextResponse(text, {
+    status: res.status,
+    headers: { 'Content-Type': 'application/json' },
+  });
+}
+
+export async function DELETE(request: NextRequest) {
+  const date = request.nextUrl.searchParams.get('date');
+  const res = await fetch(`${API_BASE}/api/meal-plan/${date}`, {
+    method: 'DELETE',
+    cache: 'no-store',
+  });
+  return new NextResponse(null, { status: res.status });
+}