feat(quick-261008-who): eigene Module beim Start vorladen — Durchstich

- Spalte User.customModulePreloadIds, PUT /custom-modules/:id/preload (Grenze 8, 404 fuer Fremdes)
- Vorlade-Planer und -Komponente, Speicher preload()/pinned, Ersatzgroesse im Behaelter
- E2E-Skript gegen die API

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

apps/web/src/lib/custom-modules-api.test.ts

@@ -6,6 +6,7 @@ import {
   deleteCustomModule,
   getCustomModule,
   listCustomModules,
+  setCustomModulePreload,
   updateCustomModule,
 } from './custom-modules-api';
 
@@ -79,3 +80,35 @@ describe('custom-modules-api', () => {
     expect(mockFetch.mock.calls[1][1].method).toBe('DELETE');
   });
 });
+
+describe('setCustomModulePreload (quick-261008-who)', () => {
+  it('ruft PUT /custom-modules/:id/preload mit JSON-Koerper und credentials include', async () => {
+    mockFetch.mockResolvedValue({
+      ok: true,
+      status: 200,
+      json: async () => ({ id: 'a b', preload: true, preloadCount: 1 }),
+    });
+    const res = await setCustomModulePreload('a b', true);
+    expect(res).toEqual({ id: 'a b', preload: true, preloadCount: 1 });
+    const [url, init] = mockFetch.mock.calls[0];
+    expect(String(url)).toMatch(/\/custom-modules\/a%20b\/preload$/);
+    expect(init.method).toBe('PUT');
+    expect(init.credentials).toBe('include');
+    expect(JSON.parse(init.body)).toEqual({ preload: true });
+  });
+
+  it('409 bleibt als CustomModuleRequestError mit Status erkennbar', async () => {
+    mockFetch.mockResolvedValue({
+      ok: false,
+      status: 409,
+      json: async () => ({ message: 'Grenze' }),
+    });
+    await expect(setCustomModulePreload('a', true)).rejects.toMatchObject({
+      status: 409,
+      message: 'Grenze',
+    });
+    await expect(setCustomModulePreload('a', true)).rejects.toBeInstanceOf(
+      CustomModuleRequestError,
+    );
+  });
+});