feat(recipes): add /recipes/new route with create action

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

frontend/src/routes/(app)/recipes/new/page.server.test.ts

@@ -0,0 +1,53 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+
+vi.mock('$env/dynamic/private', () => ({
+	env: { BACKEND_URL: 'http://localhost:8080' }
+}));
+
+const mockGet = vi.fn();
+const mockPost = vi.fn();
+vi.mock('$lib/server/api', () => ({
+	apiClient: () => ({ GET: mockGet, POST: mockPost })
+}));
+
+describe('new recipe page — load', () => {
+	let load: any;
+
+	beforeEach(async () => {
+		mockGet.mockReset();
+		mockPost.mockReset();
+		vi.resetModules();
+		const mod = await import('./+page.server');
+		load = mod.load;
+	});
+
+	const mockTags = [
+		{ id: 't1', name: 'Pasta', tagType: 'category' },
+		{ id: 't2', name: 'Fleisch', tagType: 'category' }
+	];
+
+	it('fetches tags from GET /v1/tags', async () => {
+		mockGet.mockResolvedValue({ data: mockTags, error: undefined });
+		await load({ fetch: vi.fn() } as any);
+		expect(mockGet).toHaveBeenCalledWith('/v1/tags', expect.anything());
+	});
+
+	it('returns categories filtered from tags', async () => {
+		mockGet.mockResolvedValue({ data: mockTags, error: undefined });
+		const result = await load({ fetch: vi.fn() } as any);
+		expect(result.categories).toHaveLength(2);
+		expect(result.categories[0].name).toBe('Pasta');
+	});
+
+	it('returns empty categories when API fails', async () => {
+		mockGet.mockResolvedValue({ data: undefined, error: { status: 500 } });
+		const result = await load({ fetch: vi.fn() } as any);
+		expect(result.categories).toEqual([]);
+	});
+
+	it('returns null recipe for new form', async () => {
+		mockGet.mockResolvedValue({ data: mockTags, error: undefined });
+		const result = await load({ fetch: vi.fn() } as any);
+		expect(result.recipe).toBeNull();
+	});
+});