Add Lieferungen section with supplier CRUD and delivery create/list.

Wire /lieferung sub-nav (list, neu, lieferanten) to supplier and delivery APIs.

src/api/ApiClient.js

@@ -71,6 +71,30 @@ export class ApiClient {
       delete: (id) => this.#empty('DELETE', `/api/brand/${enc(id)}`),
     };
 
+    this.supplier = {
+      /** GET /api/supplier → { suppliers: Supplier[] } */
+      list: () => this.#json('GET', '/api/supplier'),
+      /** POST /api/supplier → 201 { supplier } */
+      create: (body) => this.#json('POST', '/api/supplier', { body }),
+      /** PATCH /api/supplier/{id} → { supplier } */
+      update: (id, body) => this.#json('PATCH', `/api/supplier/${enc(id)}`, { body }),
+      /** DELETE /api/supplier/{id} → 204 */
+      delete: (id) => this.#empty('DELETE', `/api/supplier/${enc(id)}`),
+    };
+
+    this.delivery = {
+      /** GET /api/delivery → { deliveries: DeliverySummary[] } */
+      list: () => this.#json('GET', '/api/delivery'),
+      /** GET /api/delivery/{id} → { delivery: Delivery } */
+      get: (id) => this.#json('GET', `/api/delivery/${enc(id)}`),
+      /** POST /api/delivery → 201 { delivery: Delivery } */
+      create: (body) => this.#json('POST', '/api/delivery', { body }),
+      /** PATCH /api/delivery/{id} → { delivery: Delivery } */
+      update: (id, body) => this.#json('PATCH', `/api/delivery/${enc(id)}`, { body }),
+      /** DELETE /api/delivery/{id} → 204 */
+      delete: (id) => this.#empty('DELETE', `/api/delivery/${enc(id)}`),
+    };
+
     this.category = {
       /** GET /api/category/tree */
       tree: () => this.#json('GET', '/api/category/tree'),

src/api/StorageManager.js

@@ -291,6 +291,8 @@ export class StorageManager extends ApiClient {
     const companyCache = createCache('GET /company', () => this.#loadCompanies());
     const categoryTreeCache = createCache('GET /category/tree', () => this.#loadCategoryTree());
     const posterminalCache = createCache('GET /posterminal', () => this.#loadPosterminals());
+    const supplierCache = createCache('GET /supplier', () => this.#loadSuppliers());
+    const deliveryCache = createCache('GET /delivery', () => this.#loadDeliveries());
 
     Object.defineProperties(this, {
       authMePromise: { get: () => authMeCache.promise },
@@ -324,6 +326,16 @@ export class StorageManager extends ApiClient {
       posterminalPromise: { get: () => posterminalCache.promise },
       updatePosterminal: { value: posterminalCache.update },
 
+      supplierPromise: { get: () => supplierCache.promise },
+      updateSupplier: { value: supplierCache.update },
+      /** Settled GET /supplier list, or undefined. */
+      suppliers: { get: () => supplierCache.value },
+
+      deliveryPromise: { get: () => deliveryCache.promise },
+      updateDelivery: { value: deliveryCache.update },
+      /** Settled GET /delivery list, or undefined. */
+      deliveries: { get: () => deliveryCache.value },
+
       /** Close and reopen GET /api/events (required after selected-company change). */
       reconnectEvents: { value: () => this.#reconnectEvents() },
     });
@@ -444,6 +456,18 @@ export class StorageManager extends ApiClient {
     return requireArray(data.posterminals, 'posterminals');
   }
 
+  async #loadSuppliers() {
+    const data = await this.supplier.list();
+    requireObject(data, 'GET /api/supplier');
+    return requireArray(data.suppliers, 'suppliers');
+  }
+
+  async #loadDeliveries() {
+    const data = await this.delivery.list();
+    requireObject(data, 'GET /api/delivery');
+    return requireArray(data.deliveries, 'deliveries');
+  }
+
   async doSearch({ target, filter, offset, maxCount, onUpdate }) {
     const articles = await this.articleIndexPromise;
     const query = target.trim().toLowerCase();

src/api/index.js

@@ -521,6 +521,84 @@ export const brand = {
   },
 };
 
+/**
+ * Company-scoped suppliers / Lieferanten (selectedCompanyId from session).
+ * Shape: Supplier = { id, name, createdAt, updatedAt }
+ */
+export const supplier = {
+  /** GET /api/supplier → { suppliers: Supplier[] } */
+  list() {
+    return http('/api/supplier');
+  },
+
+  /**
+   * POST /api/supplier
+   * Body: { name } — empty name ⇒ 400 Name required.
+   * → 201 { supplier: Supplier }
+   */
+  create(body) {
+    return http('/api/supplier', { method: 'POST', body });
+  },
+
+  /**
+   * PATCH /api/supplier/:id
+   * Body: { name } — empty name ⇒ 400 Name required.
+   * → 200 { supplier: Supplier }
+   */
+  update(id, body) {
+    return http(`/api/supplier/${id}`, { method: 'PATCH', body });
+  },
+
+  /** DELETE /api/supplier/:id → 204 */
+  delete(id) {
+    return http(`/api/supplier/${id}`, { method: 'DELETE' });
+  },
+};
+
+/**
+ * Company-scoped goods receipts (manifest type = delivery).
+ * DeliverySummary = { id, number, type: 'delivery', supplierId, date }
+ * DeliveryLine = { id, articleId, sku, amount, net, transactedAmount, rebate, tax, comment }
+ * Delivery = DeliverySummary & { lines: DeliveryLine[] }
+ * DeliveryLineInput = { sku, amount, net, tax, rebate?, transactedAmount?, comment? }
+ */
+export const delivery = {
+  /** GET /api/delivery → { deliveries: DeliverySummary[] } */
+  list() {
+    return http('/api/delivery');
+  },
+
+  /** GET /api/delivery/:id → { delivery: Delivery } */
+  get(id) {
+    return http(`/api/delivery/${id}`);
+  },
+
+  /**
+   * POST /api/delivery
+   * Body: { number, date, supplierId?, lines: DeliveryLineInput[] }
+   * Line requires sku, amount, net, tax. rebate→0, transactedAmount→amount.
+   * → 201 { delivery: Delivery }
+   */
+  create(body) {
+    return http('/api/delivery', { method: 'POST', body });
+  },
+
+  /**
+   * PATCH /api/delivery/:id
+   * Body: partial { number?, date?, supplierId?, lines? }.
+   * If lines present, replaces all lines; if omitted, lines unchanged.
+   * → 200 { delivery: Delivery }
+   */
+  update(id, body) {
+    return http(`/api/delivery/${id}`, { method: 'PATCH', body });
+  },
+
+  /** DELETE /api/delivery/:id → 204 */
+  delete(id) {
+    return http(`/api/delivery/${id}`, { method: 'DELETE' });
+  },
+};
+
 export const company = {
   /** GET /api/company → { companies: [...] } */
   list() {
@@ -697,6 +775,8 @@ export default {
   category,
   company,
   posterminal,
+  supplier,
+  delivery,
   thumb,
   unit,
 };