feat: Implement quick import feature for recipes

- Added QuickImportController and QuickImportService to handle recipe imports from URLs and file paths.
- Created QuickImportModule to encapsulate the quick import functionality.
- Developed frontend ImportFilePage for users to upload files or enter URLs for recipe import.
- Integrated API proxy to communicate with the backend for quick import requests.
- Implemented WriteRecipePage for users to manually input recipes with Markdown support.
- Added page routing for the new import and write recipe functionalities.

frontend/app/api/quick-import-proxy/route.ts

@@ -0,0 +1,39 @@
+import { NextRequest, NextResponse } from 'next/server';
+
+export async function POST(request: NextRequest) {
+  try {
+    const { input } = await request.json();
+
+    if (!input || typeof input !== 'string') {
+      return NextResponse.json(
+        { error: 'Du måste ange en URL eller filsökväg' },
+        { status: 400 }
+      );
+    }
+
+    // Anropa backend
+    const backendUrl = process.env.NEXT_PUBLIC_API_URL || 'http://localhost:8080';
+    const response = await fetch(`${backendUrl}/api/quick-import`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ input: input.trim() }),
+    });
+
+    if (!response.ok) {
+      const errorData = await response.json().catch(() => ({}));
+      return NextResponse.json(
+        { error: errorData.message || 'Importen misslyckades' },
+        { status: response.status }
+      );
+    }
+
+    const data = await response.json();
+    return NextResponse.json(data);
+  } catch (error) {
+    console.error('Quick import error:', error);
+    return NextResponse.json(
+      { error: 'Serverfelet vid import. Försök igen senare.' },
+      { status: 500 }
+    );
+  }
+}